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31 Cards in this Set
- Front
- Back
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A round, three-dimensional object whose surface is the same distance from its center at all points; Earth is a sphere that bulges somewhat at the equator and is slightly flattened at the poles
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Sphere
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Imaginary vertical line that cuts through the center of Earth and around which Earth spins
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Axis
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Spinning of Earth on its imaginary axis, which takes about 24 hours to complete, and causes day and night to occur
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Rotation
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Earth's yearlong elliptical orbit around the Sun
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Revolution
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Elongated, closed curve that describes Earth's yearlong orbit around the Sun
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Ellipse
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Twice-yearly point at which the Sun reaches its greatest distance north or south of the equator
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Solstice
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Twice-yearly time(each spring and fall) when the Sun is directly over the equator and the number of daylight and nighttime hours are equal worldwide
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Equinox
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Change in appearance of the Moon as viewed from Earth, due to the relative positions of the Moon, Earth, and the Sun
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Moon phase
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Moon phase that occurs when the Moon is between Earth and the Sun, at which point the Moon cannot be seen
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New moon
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Describes phases following a new moon, as more of the Moon's lighted side becomes visible
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Waxing
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Phase that occurs when all of the Moon's surface facing Earth reflects light
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Full moon
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Describes phases that occur after a full moon, as the visible lighted side of the Moon grows smaller
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Waning
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Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
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Solar eclipse
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Occurs when Earth's shadow falls on the Moon
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Lunar Eclipse
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Dark-colored, 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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Maria
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A round, three-dimensional object whose surface is the same distance from its center at all points; Earth is a sphere that bulges somewhat at the equator and is slightly flattened at the poles
|
Sphere
|
|
|
Imaginary vertical line that cuts through the center of Earth and around which Earth spins
|
Axis
|
|
|
Spinning of Earth on its imaginary axis, which takes about 24 hours to complete, and causes day and night to occur
|
Rotation
|
|
|
Earth's yearlong elliptical orbit around the Sun
|
Revolution
|
|
|
Elongated, closed curve that describes Earth's yearlong orbit around the Sun
|
Ellipse
|
|
|
Twice-yearly point at which the Sun reaches its greatest distance north or south of the equator
|
Solstice
|
|
|
Twice-yearly time(each spring and fall) when the Sun is directly over the equator and the number of daylight and nighttime hours are equal worldwide
|
Equinox
|
|
|
Change in appearance of the Moon as viewed from Earth, due to the relative positions of the Moon, Earth, and the Sun
|
Moon phase
|
|
|
Moon phase that occurs when the Moon is between Earth and the Sun, at which point the Moon cannot be seen
|
New moon
|
|
|
Describes phases following a new moon, as more of the Moon's lighted side becomes visible
|
Waxing
|
|
|
Phase that occurs when all of the Moon's surface facing Earth reflects light
|
Full moon
|
|
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Describes phases that occur after a full moon, as the visible lighted side of the Moon grows smaller
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Waning
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Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
|
Solar eclipse
|
|
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Occurs when Earth's shadow falls on the Moon
|
Lunar Eclipse
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|
|
Dark-colored, 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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Maria
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A depression left on the surface of the Moon caused by an object striking its surface
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Impact Basin
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