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8.4: Igneous Landforms and Geothermal Activity

Difficulty Level: At Grade Created by: CK-12
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Lesson 8.4: True or False

Name___________________ Class______________ Date________

Write true if the statement is true or false if the statement is false.

_____ 1. Intrusive igneous rocks are never visible on Earth’s surface.

_____ 2. A lava dome is any mountain that forms from lava.

_____ 3. The lava that forms a lava dome is thin and runny.

_____ 4. A lava plateau forms when a volcano produces very little lava.

_____ 5. Lava from shield volcanoes created the Hawaiian Islands.

_____ 6. Intrusions form on the surface and later are buried by sediments.

_____ 7. The water in hot springs is heated by magma.

Lesson 8.4: Critical Reading

Name___________________ Class______________ Date________

Read this passage based on the text and answer the questions that follow.

Hot Springs and Geysers

Underground water works its way through porous rocks or soil. Sometimes this water is heated by nearby magma. If the water makes its way to the surface, it forms a hot spring or geyser.

When hot water rises gently to the surface, it creates a hot spring. A hot spring forms where a crack in the ground allows hot water to reach the surface. Many hot springs are used by people as natural hot tubs. Some people believe that hot springs can cure illnesses. Hot springs are found all over the world, even in Antarctica.

Geysers are also created by water that is heated below Earth’s surface. The water may be superheated by magma and become trapped in a narrow passageway. The heat and pressure build as more water is added. When the pressure becomes great enough, the superheated water bursts onto the surface. The eruption of hot water is a geyser. Not many areas of the world have the right conditions for geysers to form. Only about 1,000 geysers exist worldwide. About half of them are in the United States. The most famous geyser is Old Faithful at Yellowstone National Park. It erupts every 60 to 70 minutes with a plume of hot water that shoots nearly 60 meters up into the air. It is rare for a geyser to erupt so regularly, which is how Old Faithful got its name.


  1. What causes underground water to get hot?
  2. How does a hot spring form?
  3. Where are hot springs found, and how do people use hot springs?
  4. How does a geyser form?
  5. Why are geysers relatively few in number?
  6. How did the most famous geyser get its name?

Lesson 8.4: Multiple Choice

Name___________________ Class______________ Date________

Circle the letter of the correct choice.

  1. When lava is thick it
    1. travels far from vents.
    2. forms a caldera.
    3. flows rapidly.
    4. none of the above
  2. Lava that flows from vents at mid-ocean ridges
    1. forms composite volcanoes.
    2. creates lava plateaus.
    3. creates lava domes.
    4. is thin and runny.
  3. Examples of lava plateaus include the
    1. ocean basins.
    2. Columbia Plateau.
    3. Hawaiian Islands.
    4. two of the above
  4. An intrusion forms when
    1. a volcano erupts.
    2. magma cools underground.
    3. lava hardens at the surface.
    4. lava is very thin.
  5. Which statement about hot springs is false?
    1. They are very rare.
    2. They are found in Antarctica.
    3. They are used as natural hot tubs.
    4. They are thought to cure illnesses.
  6. A geyser forms when underground water is
    1. superheated.
    2. under pressure.
    3. trapped in a narrow passage.
    4. all of the above
  7. Which statement about geysers is false?
    1. There are only about 1000 geysers in the world.
    2. About half the world’s geysers are in the U.S.
    3. The water in geysers is heated by magma.
    4. All geysers erupt on a regular schedule.

Lesson 8.4: Matching

Name___________________ Class______________ Date________

Match each definition with the correct term.


_____ 1. hot water that seeps out of a crack at the surface

_____ 2. igneous rock formation that results when lava cools in the middle of a volcanic crater

_____ 3. hot water under pressure that forcefully erupts out of the surface

_____ 4. type of igneous rock that forms when magma cools below Earth’s surface

_____ 5. type of igneous rock that forms when lava cools on Earth’s surface

_____ 6. flat surface of igneous rock that forms when thin lava flows over a large area


a. extrusive igneous rock

b. intrusive igneous rock

c. lava dome

d. lava plateau

e. hot spring

f. geyser

Lesson 8.4: Fill in the Blank

Name___________________ Class______________ Date________

Fill in the blank with the appropriate term.

  1. The lava that forms a lava dome is __________ lava.
  2. The lava that forms a lava plateau is __________ lava.
  3. The lava that forms the ocean floor is __________ lava.
  4. Intrusions become landforms if they are exposed by __________.
  5. Granite __________ form the Sierra Nevada Mountains in California.
  6. Underground water may become very hot if it is heated by nearby __________.
  7. The most famous geyser in the U.S. is __________ in Yellowstone National Park.

Lesson 8.4: Critical Writing

Name___________________ Class______________ Date________

Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences.

Compare and contrast intrusive and extrusive igneous rocks.

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