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6.23: Tides

Difficulty Level: Basic Created by: CK-12
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Vocabulary

high tide

Highest water levels during a day; high tides are caused by the gravitational pull of the Moon.

low tide

Lowest water levels during a day; these occur when high tide is one-quarter of the way around Earth’s sphere.

neap tide

Smallest tidal range in a lunar month; this coincides with the first- and third-quarter moons when the Sun and Moon are at 90o relative to each other.

spring tide

Large tidal range that occurs when the Moon, Sun, and Earth area aligned; this happens at full and new moon phases.

tidal range

The difference between the high and low tide in a day.

tide

Regular rising and falling of Earth’s surface waters twice a tidal day; this is the result of the gravitational attraction of the Moon and Sun on Earth.

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Difficulty Level:
Basic

Concept Nodes:

Grades:
6 , 7
Date Created:
Jan 04, 2013
Last Modified:
Aug 29, 2016
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