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Chapter 20 - Vocab -
Chapter 20 - Vocab - The Sun-Earth-Moon system
| Question | Answer |
|---|---|
| Orbit | The path an object follows as it moves around another object. |
| Revolution | The motion of one object around another object. |
| Rotation | A spinning motion. |
| Rotation Axis | The line on which an object rotates. |
| Solsitce | A day when Earth's rotation axis is the most toward or away from the Sun. |
| Equinox | A day when Earth's rotation axis is leaning along Earth's orbit, neither toward nor away from the Sun. |
| Maria | The large, dark, flat areas of the Moon. |
| Phase | The portion of the moon or planet reflecting light as seen from Earth is called a phase. |
| Waxing phase | The time more of the moon's near side is lit each night. |
| Waning phase | The time less of the moon's near side is lit each night. |
| Umbra | The central, darker part of a shadow where light is totally blocked. |
| Penumbra | The lighter part of a shadow where light is partaclly blocked. |
| Solar Eclipse | An event which the Earth's shadow appears on Earth's surface. |
| Lunar Eclipse | An event which the Moon moves into Earth's shadow. |
| Tide | The daily rise and fall of sea level. |