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10 Cards in this Set
- Front
- Back
axis
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imaginary vertical line that cuts through the center of Earth and around which Earth spins.
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ellipse
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elongated, closed curve that describes Earth's yearlong orbit around the sun.
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equinox
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twice-yearly each time spring and fall come when the sun is directly over the equator and the number of daylight and nightime hours are equal worldwide.
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full moon
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phase that occurs when all of the Moon's surface facing Earth reflects light.
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impact basin
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a hollow left on the surface of the moon caused by an object striking it's surface.
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lunar eclipse
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occurs when the earth's shadow falls on the moon.
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maria
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dark-colared, relatively flat regions of the moon formed when ancient lava reached the surface and filled craters on the moon's surface.
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moon phase
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change in apearance of the moon as viewed from Earth, due to the relative positions of the moon, Earth, and sun.
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new moon
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moon phase that occurs when the moon is between Earth and sun, at which point the moon cannot be seen because its lighted half is facing the sun and its dark side faces Earth.
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revolution
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earth's yearlong elliptical orbit around the sun.
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