<meta http-equiv="refresh" content="1; url=/nojavascript/"> Meteors | CK-12 Foundation
Dismiss
Skip Navigation
You are reading an older version of this FlexBook® textbook: CK-12 Earth Science Concepts For Middle School Go to the latest version.

13.18: Meteors

Difficulty Level: Basic / At Grade Created by: CK-12
%
Best Score
Practice Meteors
Practice
Best Score
%
Practice Now

Is this a comet?

When a meteor shoots through the atmosphere it burns and glows. When we look up and see one, we call it a shooting star. In this image, the meteor looks like a comet. No need to go anywhere to see this. Just try to catch one of these meteor showers: the Perseids in mid-August or the Geminids in mid-December. Look for information on the dates and whether the moon will not be lighting up the sky.

Meteors

If you look at the sky on a dark night, you may see a meteor, like in Figure below. A meteor forms a streak of light across the sky. People call them shooting stars because that's what they look like. But meteors are not stars at all. The light you see comes from a small piece of matter burning up as it flies through Earth's atmosphere.

Meteors burning up as they fall through Earth's atmosphere.

Meteoroids

Before these small pieces of matter enter Earth’s atmosphere, they are called meteoroids. Meteoroids are as large as boulders or as small as tiny sand grains. Larger objects are called asteroids; smaller objects are interplanetary dust. Meteoroids sometimes cluster together in long trails. They are the debris left behind by comets. When Earth passes through a comet trail, there is a meteor shower. During a meteor shower, there are many more meteors than normal for a night or two.

http://www.youtube.com/watch?v=9UwJFWCLzS4

Meteorites

A meteoroid is dragged towards Earth by gravity and enters the atmosphere. Friction with the atmosphere heats the object quickly, so it starts to vaporize. As it flies through the atmosphere, it leaves a trail of glowing gases. The object is now a meteor. Most meteors vaporize in the atmosphere. They never reach Earth’s surface. Large meteoroids may not burn up entirely in the atmosphere. A small core may remain and hit the Earth’s surface. This is called a meteorite.

Meteorites provide clues about our solar system. Many were formed in the early solar system (Figure below). Some are from asteroids that have split apart. A few are rocks from nearby bodies like Mars. For this to happen, an asteroid smashed into Mars and sent up debris. A bit of the debris entered Earth’s atmosphere as a meteor.

The Mars Rover, Opportunity, found a metal meteorite on the Red Planet.

Vocabulary

  • meteor: Material from outer space that burns up as it enters Earth's atmosphere.
  • meteor shower: A time of frequent meteors.
  • meteorite: Meteors that strike Earth.
  • meteoroid: A small rock in interplanetary space that has not yet entered Earth's atmosphere.

Summary

  • A meteor that strikes Earth's surface is a meteorite.
  • Many meteorites are remnants of the earliest material that formed in the solar system.
  • Shooting stars are meteors that burn up in Earth's atmosphere.

Practice

Use these resources to answer the questions that follow.

What is A Meteor at http://www.videojug.com/film/what-is-a-meteor (3:27)

  1. What are meteoroids?
  2. What are meteors?
  3. What happens to most meteors in the atmosphere?
  4. What is a fireball?
  5. What are meteorites?
  6. Explain the difference between sporadic meteors and meteor showers.
  7. What causes meteor showers?
  8. When does the Perseid meteor shower occur?

Review

  1. Compare and contrast meteoroid, meteor, and meteorite.
  2. What are meteorites important to scientists?
  3. Why are meteors known as shooting stars?

Image Attributions

Description

Difficulty Level:

Basic

Concept Nodes:

Grades:

6 , 7 , 8

Date Created:

Jan 04, 2013

Last Modified:

Feb 26, 2014
Files can only be attached to the latest version of Modality

Reviews

Please wait...
You need to be signed in to perform this action. Please sign-in and try again.
Please wait...
Image Detail
Sizes: Medium | Original
 
SCI.ESC.935.3.L.2
", "blacklisted": 0, "width": "394", "url": "http://s1.thingpic.com/images/PU/D6VKQcVACSCyUiwQvorx.png?hash=d34bce5d2149ecdc1d1ccec779e45983", "thumbnail": null, "height": "315", "caption": null, "iframe": "
", "provider": {"id": 55, "name": "ThingLink"}, "type": "customembed", "id": 89882, "description": null}, "uri": "http://s1.thingpic.com/images/PU/D6VKQcVACSCyUiwQvorx.png", "id": 6518993, "permaUri": "/interactive/http%3A//s1.thingpic.com/images/PU/D6VKQcVACSCyUiwQvorx.png", "streamable": 0, "realm": null, "isAbused": false, "name": "Meteors Mind Map", "filesize": null, "revisions": [{"hash": null, "created": "2012-09-20T23:43:50-07:00", "resourceID": 6518993, "isPublic": true, "publishTime": "2013-09-30T14:17:13-07:00", "filesize": null, "id": 5971999, "revision": "1"}], "type": "interactive", "thumbnail": null, "revision": "1", "handle": "http://s1.thingpic.com/images/PU/D6VKQcVACSCyUiwQvorx.png", "description": "Illustrated mind map for Meteors.", "authors": "Charlene Calaunan", "ownerID": 3, "isExternal": 1, "resourceRevisionID": 5971999, "license": "CC BY NC SA", "created": "2012-09-20T23:43:50-07:00", "publishTime": "2013-09-30T14:17:13-07:00", "originalName": "http://s1.thingpic.com/images/PU/D6VKQcVACSCyUiwQvorx.png", "isAttachment": 1}, {"publishTime": "2012-09-28T23:00:54-07:00", "id": 6518208, "permaUri": "/lessonplan/http%3A//www.spacegrant.hawaii.edu/class_acts/RegolithTe.html", "streamable": 0, "realm": null, "isAbused": false, "filesize": null, "revisions": [{"hash": null, "created": "2012-09-20T23:20:21-07:00", "resourceID": 6518208, "isPublic": true, "publishTime": "2012-09-28T23:00:54-07:00", "filesize": null, "id": 5971214, "revision": "1"}], "type": "lessonplan", "revision": "1", "handle": "http://www.spacegrant.hawaii.edu/class_acts/RegolithTe.html", "description": "Students determine the effects of erosion on regolith formation and deposition on Earth as well as regolith formation on the Moon by meteoritic activity.", "isExternal": 1, "authors": "Hawaii Space Grant Consortium", "ownerID": 3, "name": "Regolith Formation Lesson Plan", "resourceRevisionID": 5971214, "license": "CC BY NC SA", "created": "2012-09-20T23:20:21-07:00", "uri": "http://www.spacegrant.hawaii.edu/class_acts/RegolithTe.html", "originalName": "http://www.spacegrant.hawaii.edu/class_acts/RegolithTe.html", "isAttachment": 1}, {"publishTime": "2012-09-28T23:00:56-07:00", "id": 6518209, "permaUri": "/handout/http%3A//www.spacegrant.hawaii.edu/class_acts/Regolith.html", "streamable": 0, "realm": null, "isAbused": false, "filesize": null, "revisions": [{"hash": null, "created": "2012-09-20T23:20:22-07:00", "resourceID": 6518209, "isPublic": true, "publishTime": "2012-09-28T23:00:56-07:00", "filesize": null, "id": 5971215, "revision": "1"}], "type": "handout", "revision": "1", "handle": "http://www.spacegrant.hawaii.edu/class_acts/Regolith.html", "description": "Student Handout for Lab activity in Regolith Formation Lesson Plan.", "isExternal": 1, "authors": "Hawaii Space Grant Consortium", "ownerID": 3, "name": "Regolith Formation Handout", "resourceRevisionID": 5971215, "license": "CC BY NC SA", "created": "2012-09-20T23:20:22-07:00", "uri": "http://www.spacegrant.hawaii.edu/class_acts/Regolith.html", "originalName": "http://www.spacegrant.hawaii.edu/class_acts/Regolith.html", "isAttachment": 1}, {"publishTime": "2012-09-28T23:46:13-07:00", "id": 6518822, "permaUri": "/cthink/Discussion_Meteors.docx", "streamable": 0, "realm": null, "isAbused": false, "filesize": 14688, "revisions": [{"hash": null, "created": "2012-09-20T23:38:24-07:00", "resourceID": 6518822, "isPublic": true, "publishTime": "2012-09-28T23:46:13-07:00", "filesize": 14688, "id": 5971828, "revision": "1"}], "type": "cthink", "revision": "1", "handle": "Discussion_Meteors.docx", "description": "A list of student-submitted discussion questions for Meteors.", "isExternal": 0, "authors": "CK-12 2012 summer interns", "ownerID": 3, "name": "Meteors Discussion Questions", "resourceRevisionID": 5971828, "license": "CC BY NC SA", "created": "2012-09-20T23:38:24-07:00", "uri": "/flx/show/cthink/Discussion_Meteors.docx", "originalName": "Discussion_Meteors.docx", "isAttachment": 1}, {"publishTime": "2013-07-05T18:04:55-07:00", "id": 6520013, "permaUri": "/web/http%3A//s.tudy.it/tw95v31", "streamable": 0, "realm": null, "isAbused": false, "filesize": null, "revisions": [{"hash": null, "created": "2012-09-21T01:12:31-07:00", "resourceID": 6520013, "isPublic": true, "publishTime": "2013-07-05T18:04:55-07:00", "filesize": null, "id": 5973022, "revision": "1"}], "type": "web", "revision": "1", "handle": "http://s.tudy.it/tw95v31", "description": "These flashcards help you study important terms and vocabulary from Meteors.", "isExternal": 1, "authors": "Danielle Pintz", "ownerID": 3, "name": "Meteors Flashcards", "resourceRevisionID": 5973022, "license": "CC BY NC SA", "created": "2012-09-21T01:12:31-07:00", "uri": "http://s.tudy.it/tw95v31", "originalName": "http://s.tudy.it/tw95v31", "isAttachment": 1}, {"publishTime": "2013-09-24T14:40:29-07:00", "id": 6518348, "permaUri": "/web/http%3A//www.jpl.nasa.gov/multimedia/neo/spaceRocks.html", "streamable": 0, "realm": null, "isAbused": false, "filesize": null, "revisions": [{"hash": null, "created": "2012-09-20T23:23:22-07:00", "resourceID": 6518348, "isPublic": true, "publishTime": "2013-09-24T14:40:29-07:00", "filesize": null, "id": 5971354, "revision": "1"}], "type": "web", "revision": "1", "handle": "http://www.jpl.nasa.gov/multimedia/neo/spaceRocks.html", "description": "Explore asteroids, comets, and meteors and their relationship to earth. Make sure you check out the size matters tab on the bottom!", "isExternal": 1, "authors": "NASA", "ownerID": 3, "name": "Keeping an Eye on Space Rocks", "resourceRevisionID": 5971354, "license": "CC BY NC SA", "created": "2012-09-20T23:23:22-07:00", "uri": "http://www.jpl.nasa.gov/multimedia/neo/spaceRocks.html", "originalName": "http://www.jpl.nasa.gov/multimedia/neo/spaceRocks.html", "isAttachment": 1}, {"publishTime": "2013-08-27T11:11:52-07:00", "id": 3158767, "permaUri": "/web/http%3A//www.windows2universe.org/our_solar_system/meteors/meteors.html%26edu%3Dhigh", "streamable": 0, "realm": null, "isAbused": false, "filesize": null, "revisions": [{"hash": null, "created": "2012-08-27T20:23:19-07:00", "resourceID": 3158767, "isPublic": true, "publishTime": "2013-08-27T11:11:52-07:00", "filesize": null, "id": 2621119, "revision": "1"}], "type": "web", "revision": "1", "handle": "http://www.windows2universe.org/our_solar_system/meteors/meteors.html&edu=high", "description": "A description of what meteors are.", "isExternal": 1, "authors": "Windows To The Universe", "ownerID": 3, "name": "Meteors", "resourceRevisionID": 2621119, "license": "CC BY NC SA", "created": "2012-08-27T20:23:19-07:00", "uri": "http://www.windows2universe.org/our_solar_system/meteors/meteors.html&edu=high", "originalName": "http://www.windows2universe.org/our_solar_system/meteors/meteors.html&edu=high", "isAttachment": 1}, {"publishTime": "2013-09-06T17:41:45-07:00", "id": 6517968, "permaUri": "/reading/MeteorsWhileRead.docx", "streamable": 0, "realm": null, "isAbused": false, "filesize": 25155, "revisions": [{"hash": null, "created": "2012-09-20T23:14:34-07:00", "resourceID": 6517968, "isPublic": true, "publishTime": "2013-09-06T17:41:45-07:00", "filesize": 25155, "id": 5970974, "revision": "1"}], "type": "reading", "revision": "1", "handle": "MeteorsWhileRead.docx", "description": "To activate prior knowledge, make personal connections, reflect on key concepts, encourage critical thinking, and assess student knowledge on the topic prior to reading using a Quickwrite.", "isExternal": 0, "authors": "Joan Antony", "ownerID": 3, "name": "Meteors While Read", "resourceRevisionID": 5970974, "license": "CC BY NC SA", "created": "2012-09-20T23:14:34-07:00", "uri": "/flx/show/reading/MeteorsWhileRead.docx", "originalName": "MeteorsWhileRead.docx", "isAttachment": 1}, {"publishTime": "2013-09-06T17:41:41-07:00", "id": 6517969, "permaUri": "/reading/MeteorsPostRead.docx", "streamable": 0, "realm": null, "isAbused": false, "filesize": 40098, "revisions": [{"hash": null, "created": "2012-09-20T23:14:36-07:00", "resourceID": 6517969, "isPublic": true, "publishTime": "2013-09-06T17:41:41-07:00", "filesize": 40098, "id": 5970975, "revision": "1"}], "type": "reading", "revision": "1", "handle": "MeteorsPostRead.docx", "description": "To show how details are organized into categories that in turn are related to main ideas using a Spider Map.", "isExternal": 0, "authors": "Joan Antony", "ownerID": 3, "name": "Meteors Post Read", "resourceRevisionID": 5970975, "license": "CC BY NC SA", "created": "2012-09-20T23:14:36-07:00", "uri": "/flx/show/reading/MeteorsPostRead.docx", "originalName": "MeteorsPostRead.docx", "isAttachment": 1}], "creator": "CK-12 ", "labels": [], "file": "9524", "id": 1915516, "statistics": {"downloads": 397}, "isFavorite": false, "title": "Meteors", "creatorAuthID": 3, "offset": 15, "children": [], "parents": [[2245172, 2], [2245164, 2], [2245169, 2], [2245171, 2], [2245151, 2], [2252978, 2], [2250292, 2], [2250308, 2], [2243648, 3], [2245078, 3], [2244896, 3], [2244973, 3], [2244927, 3], [2243607, 3], [2244969, 3], [2243612, 3], [2244971, 3], [2243616, 3], [2244955, 3], [2244865, 3], [2243701, 3], [2244853, 3], [2243666, 3], [2243686, 3], [2243628, 4], [2243614, 4], [2243683, 4], [2243617, 4], [2243700, 5], [2244931, 5], [2244964, 5], [2243694, 5], [2243675, 5], [2244945, 5], [2244932, 5], [2244884, 5], [2244895, 5], [2244898, 5], [2244907, 5], [2244909, 5], [2244916, 5], [2244926, 5], [2244871, 5], [2244885, 5], [2243652, 5], [2244941, 5], [2243636, 5], [2243605, 5], [2238313, 5], [2243630, 5], [2250470, 6], [2244841, 6], [2243660, 6], [2243668, 6], [2245168, 6], [2243705, 6], [2243706, 6], [2243690, 6], [2243677, 6], [2243682, 6], [2243680, 6], [2245148, 6], [2245156, 6], [2245144, 6], [2243632, 6], [2243627, 6], [2243646, 6], [2243637, 6], [2243624, 6], [2245146, 6], [2243644, 6], [2243676, 7], [2243640, 7], [2243673, 7], [2243634, 7], [2243639, 7], [2243626, 7], [2243665, 7], [2243667, 7], [2243647, 7], [2245162, 7], [2245152, 7], [2245159, 7], [2243685, 7], [2243689, 7], [2245154, 7], [2243696, 7], [2247820, 7], [2245077, 7], [2247819, 7], [2245178, 7], [2245177, 7], [2245173, 7], [2245079, 7], [2245167, 7], [2245170, 7], [2248435, 8], [2285751, 9], [2285620, 9], [2243650, 9], [2243610, 9], [2243684, 9], [2243604, 9], [2243664, 9], [2238302, 10], [2238307, 10], [2238305, 10], [2238303, 10], [2238308, 10], [2238312, 10], [2244966, 10], [2244950, 10], [2238306, 10], [2243674, 11], [2243642, 11], [2243651, 11], [2243633, 11], [2243679, 11], [2244951, 11], [1994345, 12], [2125562, 15], [2125560, 15], [2125559, 15], [2125564, 15], [1995316, 18], [2149462, 18], [2150414, 18], [2156391, 18], [2161757, 18], [2168692, 18], [2176876, 18], [2182619, 18], [2183801, 18], [2201396, 18], [2202141, 18], [2149360, 18], [2147444, 18], [2120252, 18], [2120560, 18], [2127716, 18], [2131158, 18], [2134792, 18], [2140515, 18], [2142920, 18], [2102876, 18], [1928251, 18], [1931574, 18], [1935586, 18], [1938286, 18], [1949141, 18], [1957239, 18], [1969664, 18], [1971162, 18], [1926998, 18], [1923381, 18], [1922880, 18], [1915522, 18], [1917330, 18], [2063238, 18], [1918797, 18], [1973012, 18], [1973056, 18], [2029037, 18], [2033371, 18], [2036406, 18], [2040603, 18], [2043445, 18], [2046004, 18], [2047112, 18], [2060910, 18], [2019484, 18], [2010721, 18], [2001009, 18], [1974049, 18], [1975937, 18], [1975952, 18], [1977696, 18], [1980752, 18], [1981978, 18], [1987397, 18], [2101560, 18], [2060986, 18], [2110081, 18], [2104084, 18], [2104066, 18], [2118259, 18], [2273905, 19], [2273898, 19], [2273895, 19], [2273892, 19], [2273907, 19], [2273910, 19], [2273913, 19], [2273919, 19], [2273926, 19], [2273927, 19], [2273930, 19], [2273886, 19], [2273876, 19], [2273881, 19], [2273882, 19], [2273887, 19], [2273875, 19], [2319482, 27], [2228992, 27], [2228989, 27], [2228986, 27], [2228968, 27], [1972004, 27], [2228982, 27], [1972003, 27], [1972005, 27], [1971945, 27], [1971944, 27], [1972006, 27], [1971949, 27], [1971943, 27], [1972007, 27], [1972008, 27], [2319481, 27], [2229030, 28], [2229044, 28], [2229027, 28], [2229022, 28], [2229008, 28], [2235737, 29], [2235740, 29], [2241872, 29], [2241880, 29], [2241927, 29], [2241924, 29], [2241917, 29], [2241912, 29], [2241901, 29], [2241889, 29], [2235642, 29], [2229118, 29], [2229130, 29], [2231474, 29], [2231484, 29], [2231496, 29], [2231528, 29], [2235565, 29], [2235568, 29], [2235578, 29], [2235587, 29], [2235602, 29], [2235614, 29], [2235638, 29], [2235635, 29], [2235656, 29], [2235664, 29], [2235670, 29], [2235729, 29], [2235734, 29], [2235721, 29], [2231499, 29], [2229111, 29], [2235718, 29], [2235675, 29], [2235715, 29], [2235679, 29], [2235700, 29], [2229087, 30], [2229094, 30], [2229103, 30], [2229067, 31], [2343050, 39], [2342952, 39], [2342950, 39], [2343058, 39], [2342948, 39], [2342944, 39], [2342954, 39], [2342957, 39], [2342958, 39], [2343035, 39], [2343033, 39], [2343032, 39], [2343013, 39], [2342963, 39], [2343012, 39], [2342962, 39], [2342961, 39]], "isLatest": true, "revision": "16", "artifactRevisionID": 1915516, "handle": "Meteors", "creatorID": 3, "authors": [{"roleID": 3, "sequence": 1, "role": "author", "name": "Dana Desonie, Ph.D.", "artifactID": 8853}], "artifactID": 8853, "resourceCounts": {"web": 4, "reading": 2, "allVideos": 0, "lessonplan": 1, "studyguide": 1, "image": 3, "cover page": 1, "handout": 1, "allAttachments": 11, "pdf": 1, "cthink": 1, "contents": 1, "interactive": 1}, "language": "English", "created": "2013-08-19T16:05:09-07:00", "summary": "Describes the properties of meteors.", "encodedID": "SCI.ESC.935.3.L.1", "published": "2014-01-24T10:35:48-08:00", "pdf": ["/flx/show/pdf/Meteors_l_v16_jlb_s1.pdf"], "artifactType": "lesson"}], "realm": null, "title": "Meteors", "standardGrid": {}, "creatorAuthID": 3, "exerciseCount": 0, "feedbacks": {"rating": {"count": 0, "average": 0, "1": 0, "3": 0, "2": 0, "5": 0, "4": 0}, "voting": {"dislike": 1, "like": 0}}, "gradeGrid": [], "subjectGrid": [], "internalTagGrid": [], "tagGrid": [], "messageToUsers": null, "type": {"modality": true, "extensionType": "L", "description": "The lesson artifact", "name": "lesson", "id": 3}, "searchGrid": [], "artifactRevisionID": 1915516, "handle": "Meteors", "vocabulary": [{"languageCode": "en", "languageName": "English"}, {"languageCode": "es", "languageName": "Spanish"}], "isModality": 1, "revisionInLibrary": null, "foundationGrid": [], "stateGrid": [], "creatorID": 3, "authors": [{"roleID": 3, "sequence": 1, "role": "author", "name": "Dana Desonie, Ph.D.", "artifactID": 8853}], "artifactID": 8853, "latestRevision": "16", "license": "CC BY NC SA", "created": "2012-02-24T09:05:19-08:00", "coverImage": "/flx/show/cover%20page/222d7c135fb1a1f10cccecf2bf1b38aa-201308191376949587421077-201308191376953504872939.jpg", "level": "at grade", "latestRevisionID": 1915516, "modified": "2014-01-24T10:35:48-08:00", "summary": "Describes the properties of meteors.", "encodedID": "SCI.ESC.935.3.L.1", "artifactType": "lesson"}]}, "isModality": 1, "modality": {"artifact_type": "lesson", "weight_teacher": 1, "student_show": true, "display_label": "Read", "weight_student": 1}, "revisionInLibrary": null, "coverImageThumbLarge": "/flx/show/THUMB_LARGE/cover%20page/c4a0597e42416a8879f64013864d380d-201301081357669056338316-201301081357672630744010.jpg", "modality_display_label": "Read", "hasXhtml": true, "foundationGrid": [[1239, "Meteors", "SCI.ESC.935.3", "Meteors"]], "stateGrid": [[1937, "CA"]], "extendedArtifacts": {}, "creatorID": 3, "authors": [{"roleID": 3, "sequence": 1, "role": "author", "name": "Dana Desonie, Ph.D.", "artifactID": 1131603}], "post": {"section": {"13.19": {"domain": {"term": "Dwarf Planets", "handle": "Dwarf-Planets", "description": null, "parent": {"term": "Other Solar System Objects: Asteroids, Comets, Dwarf Planets", "handle": "Other-Solar-System-Objects-Asteroids-Comets-Dwarf-Planets", "description": null, "parent": {"term": "Solar System", "handle": "Solar-System", "description": null, "parent": {"term": "Earth in Space", "handle": "Earth-in-Space", "description": null, "parent": {"term": "Earth Science", "handle": "Earth-Science", "description": null, "parent": {"term": "Science", "handle": "Science", "description": null, "parent": {"term": "root", "handle": "root", "description": null, "encodedID": "CKT", "branch": null, "previewImageUrl": "http://www.ck12.org/media/images/modality_generic_icons/concept_gicon.png", "from": "domain", "subject": "CKT", "type": "domain", "id": 1, "name": "root"}, "previewImageUrl": "http://concepts.ck12.org/preview/introduction-to-animals.jpg", "encodedID": "SCI", "branch": null, "parentID": 1, "from": "domain", "subject": "SCI", "type": "domain", "id": 9, "name": "Science"}, "previewImageUrl": "http://concepts.ck12.org/preview/earthscience.jpg", "encodedID": "SCI.ESC", "branch": "ESC", "parentID": 9, "from": "domain", "subject": "SCI", "type": "domain", "id": 12, "name": "Earth Science"}, "previewImageUrl": "http://concepts.ck12.org/preview/earth-in-space.jpg", "encodedID": "SCI.ESC.900", "branch": "ESC", "parentID": 12, "from": "domain", "subject": "SCI", "type": "domain", "id": 1206, "name": "Earth in Space"}, "previewImageUrl": "http://concepts.ck12.org/preview/solar-system.jpg", "encodedID": "SCI.ESC.930", "branch": "ESC", "parentID": 1206, "from": "domain", "subject": "SCI", "type": "domain", "id": 1220, "name": "Solar System"}, "previewImageUrl": "http://concepts.ck12.org/preview/other-solar-system-objects-asteroids-comets-dwarf-planets.jpg", "encodedID": "SCI.ESC.935", "branch": "ESC", "parentID": 1220, "from": "domain", "subject": "SCI", "type": "domain", "id": 1236, "name": "Other Solar System Objects: Asteroids, Comets, Dwarf Planets"}, "previewImageUrl": "http://concepts.ck12.org/preview/dwarf-planets.png", "encodedID": "SCI.ESC.935.4", "branch": "ESC", "parentID": 1236, "from": "domain", "subject": "SCI", "type": "domain", "id": 1240, "name": "Dwarf Planets"}, "creator": "CK-12 ", "contributor": null, "lastRead": null, "perma": "/lesson/Dwarf-Planets-Basic", "id": 1131605, "realm": null, "title": "Dwarf Planets", "creatorAuthID": 3, "exerciseCount": 0, "feedbacks": {"rating": {"count": 0, "average": 0, "1": 0, "3": 0, "2": 0, "5": 0, "4": 0}, "voting": {"dislike": 1, "like": 5}}, "internalTagGrid": [], "messageToUsers": null, "type": {"modality": true, "extensionType": "L", "description": "The lesson artifact", "name": "lesson", "id": 3}, "searchGrid": [], "revision": "2", "artifactRevisionID": 1439323, "handle": "Dwarf-Planets-Basic", "isModality": 1, "revisionInLibrary": null, "hasXhtml": true, "stateGrid": [[1937, "CA"]], "extendedArtifacts": {}, "creatorID": 3, "authors": [{"roleID": 3, "sequence": 1, "role": "author", "name": "Dana Desonie, Ph.D.", "artifactID": 1131605}], "artifactID": 1131605, "latestRevision": "18", "license": "CC BY NC SA", "created": "2013-01-04T16:33:06-08:00", "coverImage": "/flx/show/cover%20page/b162755b8e46ee602820e7247653f18a-201301081357669056357941-201301081357672643339319.jpg", "level": "basic", "latestRevisionID": 2175929, "modified": "2014-02-26T05:54:07-08:00", "summary": "Describes the characteristics of dwarf planets.", "encodedID": "SCI.ESC.935.4.L.2", "artifactType": "lesson"}}, "parent": null}, "level": "basic", "vocabulary_info": null, "artifactID": 1131603, "latestRevision": "18", "contributed_by": "", "license": "CC BY NC SA", "tagGrid": [[9289, "meteorites"], [10167, "meteor"], [10168, "meteoroids"], [10169, "meteor shower"], [25774, "SCI.ESC.935.3.L.2"]], "coverImage": "/flx/show/cover%20page/c4a0597e42416a8879f64013864d380d-201301081357669056338316-201301081357672630744010.jpg", "created": "2013-01-04T16:32:57-08:00", "latestRevisionID": 2175927, "modified": "2014-02-26T05:54:07-08:00", "summary": "Describes the properties of meteors.", "encodedID": "SCI.ESC.935.3.L.2", "standardGrid": {}, "artifactType": "lesson", "url_mobi": null}; window.context_json_encoded = {"domain": {"term": "Science", "handle": "Science", "description": null, "parent": {"term": "root", "handle": "root", "description": null, "encodedID": "CKT", "branch": null, "previewImageUrl": "http://www.ck12.org/media/images/modality_generic_icons/concept_gicon.png", "from": "domain", "subject": "CKT", "type": "domain", "id": 1, "name": "root"}, "previewImageUrl": "http://concepts.ck12.org/preview/introduction-to-animals.jpg", "encodedID": "SCI", "branch": null, "parentID": 1, "from": "domain", "subject": "SCI", "type": "domain", "id": 9, "name": "Science"}, "creator": "CK-12 ", "labels": [], "contributor": null, "handle": "CK-12-Earth-Science-Concepts-For-Middle-School", "perma": "book/CK-12-Earth-Science-Concepts-For-Middle-School/", "url_pdf": ["/flx/show/pdf/CK-12-Middle-School-Earth-Science-Concepts_b_v2_kjm_s2.pdf", "/flx/show/pdf/CK-12-Middle-School-Earth-Science-Concepts_b_v2_xot_s2.pdf"], "url_epub": "/flx/show/epub/CK-12-Middle-School-Earth-Science-Concepts_b_v2_k8h.epub", "feedbacks": {"rating": {"count": 0, "average": 0, "1": 0, "3": 0, "2": 0, "5": 0, "4": 0}, "voting": {"dislike": 7, "like": 26}}, "conceptNode": "CK.SCI.ENG.SE", "realm": null, "resourceCounts": {"allVideos": 0, "image": 1, "cover page": 1, "allAttachments": 0, "contents": 1, "pdf": 2, "epub": 1}, "title": "CK-12 Earth Science Concepts For Middle School", "coverImageThumbSmall": "/flx/show/THUMB_SMALL/cover%20page/custom-CK-12_Middle_School_Earth_Science_Concepts-201301081357672855308086.jpg", "standardGrid": {}, "creatorAuthID": 3, "exerciseCount": 0, "id": 1131638, "gradeGrid": [[2080, "6"], [1935, "7"], [1936, "8"]], "handle-encoded": true, "subjectGrid": [[3568, "science"], [3595, "Earth Science"]], "internalTagGrid": [], "messageToUsers": null, "isLatest": false, "xhtml": "\n\n \n \n \n \n

\n Front Matter\n

\n

\n Foreword\n

\n

\n The study of Earth Science is the study of Planet Earth. Middle School Earth Science Concepts presents Earth Science as a set of concepts, with each concept centered around a specific category, such as the Earth's crust or plate tectonics. Each concept is comprised of a series of lessons, with each lesson focusing on one specific topic.\n

\n

\n Preface\n

\n

\n Dedication\n

\n

\n Chapters\n

\n

\n \"\"\n

\n
\n \n
\n

\n Back Matter\n

\n \n\n", "type": {"modality": false, "extensionType": "FB", "description": "The book artifact (student or default edition)", "name": "book", "id": 1}, "searchGrid": [], "revision": "2", "artifactRevisionID": 1439356, "lastRead": null, "isModality": 0, "revisionInLibrary": null, "coverImageThumbLarge": "/flx/show/THUMB_LARGE/cover%20page/custom-CK-12_Middle_School_Earth_Science_Concepts-201301081357672855308086.jpg", "hasXhtml": true, "foundationGrid": [[9, "Science", "SCI", "Science"], [12, "Earth Science", "SCI.ESC", "Earth-Science"]], "stateGrid": [[1937, "CA"]], "extendedArtifacts": {}, "creatorID": 3, "authors": [{"roleID": 3, "sequence": 1, "role": "author", "name": "Dana Desonie, Ph.D.", "artifactID": 1131638}], "level": null, "artifactID": 1131638, "latestRevision": "21", "contributed_by": "", "license": "CC BY NC SA", "tagGrid": [[7500, "Earth Science"], [10229, "concepts"], [14638, "middle school"], [25818, "CK.SCI.ENG.SE.1.CK-12-Middle-School-Concept-Earth-Science"]], "coverImage": "/flx/show/cover%20page/custom-CK-12_Middle_School_Earth_Science_Concepts-201301081357672855308086.jpg", "created": "2013-01-04T16:35:15-08:00", "latestRevisionID": 2302068, "modified": "2014-03-12T11:24:32-07:00", "summary": "Earth Science concepts for middle school.", "encodedID": "CK.SCI.ENG.SE.1.CK-12-Middle-School-Concept-Earth-Science", "artifactType": "book", "url_mobi": null};

Original text