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9 Cards in this Set
- Front
- Back
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amount of time it takes a comet to complete an orbit
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period
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region of the earth's atmosphere which has harmful ultraviolet radiation filtering out
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ozone layer
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group of asteroids found in the inner solar system, many which cross paths with Earth
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near earth asteroids
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length of time it takes the earth to complete its revolution
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365 1/4 days
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pieces of space debris smaller than the smallest asteroids
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meteoroids
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completion of a moon's revolution
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lunar month
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little "planets" ranging in size from a few hundred miles across to the size of a house
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asteroids
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the ocean at its lowest point on the shore
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low tide
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type of tide that occurs when the gravitational forces of the sun and the moon work against each other, resulting in weaker tides
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neap tide
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