Across
- 3. The lit part of the moon becomes smaller until only the eastern half of the Moon is visible; This is the third quarter phase.
- 8. When the entire western half of the moon is lit; The start of the lunar cycle.
- 12. These are the oldest and most highly-cratered regions of the moon.
- 15. The large, dark, flat areas on the moon.
- 16. This phase is when the Moon's near side is completely lit.
- 17. The portion of the Moon or a planet reflecting light as seen from Earth.
- 18. This phase is when the Moon's near side is completely dark.
- 19. When the Sun and Moon's gravitational effects combine and produce higher high tides and lower low tides.
- 21. When the Sun, Earth, and Moon form a right angle, the Sun's effect on the tides reduces the Moon's effect;When these tides occur, high tides are lower, and low tides are higher.
- 22. An occurrence during which the Moon's shadow appears on Earth's surface.
- 23. Phases of the moon during which less of the Moon's near side is lit each night.
- 24. Phases of the moon during which more of the Moon's near side is lit each night.
Down
- 1. When Earth's rotation axis is tilted neither toward nor away from from the sun.
- 2. Round depressions formed on the surface of a planet, moon, or other space object by impact of a meteorite.
- 4. The orbit of one object around another object.
- 5. The central, darker part of a shadow where light is totally blocked.
- 6. The path an object follows as it moves around another object.
- 7. When Earth's rotation axis is tilted toward or away from the sun.
- 9. The spin of an object around its axis.
- 10. The lighter part of a shadow where light is partially blocked.
- 11. The periodic rise and fall of the ocean's surface caused by the gravitational force between Earth and the Moon, and Earth and the Sun.
- 13. An occurrence during which the Moon moves into Earth's shadow.
- 14. These streaks extend outwards from moon craters.
- 20. The line on which and object rotates.