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S-E-M vocab
| Question | Answer |
|---|---|
| Sphere | A round, 3 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. |
| Axis | Imaginary vertical line that cuts through the center of Earth and causes it to rotate. |
| Rotation | Spinning of Earth on its imaginary axis, which takes about 24 hours to complete and causes day and night to occur. |
| Revolution | Earth's yearlong elliptical orbit around the sun. |
| Ellipse | Elongated, closed curve, such as Earth's orbit around the sun. |
| Solstice | Twice yearly point at which the sun reaches its greatest distance north or South of the Equator. |
| Equinox | Each spring and fall, it occurs when the sun is directly above Earth's equator and the number of daylight and night-time hours are nearly equal. |
| Moon Phase | Change in appearance of the moon as viewed from the Earth, due to the relative positions of the moon, Earth and Sun. |
| New Moon | Moon phase that occurs when the moon is between Earth and the Sun, at which point the Moon cannot be seen because its lighted half is facing the Sun and its dark side faces Earth. |
| Waxing | Describes phases following a new moon, as more of the Moon's lighted side becomes visible. |
| Full Moon | Phase that occurs when all of the Moon's surface facing Earth reflects light. |
| Waning | Describes phases that occur after a full moon, as the visible lighted side of the Moon grows smaller. |
| Solar Eclipse | Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth. |
| Lunar Eclipse | Occurs when Earth's Shadow falls on the moon. |
| Maria | a dark region of considerable extent on the surface of the moon |
| Impact Basin | A hollow left on the surface of the moon caused by an object striking its surface. |