Sun, Earth, and Moon System

3. the central, darkest part of a shadow
5. the phase of the Moon between New Moon and Quarter Moons
7. more of the Moon is lit each night; it appears to grow
9. the outer, lighter part of a shadow
12. occurs when the Moon creates a shadow on Earth and blocks out the Sun
13. the imaginary line that an object spins around
14. less of the Moon is lit each night; it appears to shrink
15. day when Earth's axis is pointed most toward or away from the Sun
16. the phase of the Moon between Quarter Moons and Full Moons
17. the tide during New Moon and Full Moon phases in which high tides are very high and low tides are very low
18. the cycle of the phases of the moon that takes approximately a month

1. the portion of the Moon that appears sunlit from Earth
2. the path that an object follows as it moves around another
4. occurs when the Moon moves into the shadow of the Earth
6. the motion of one object around another
8. the tide during Quarter phases of the Moon in which high tides are not too high and low tides are not too low
10. day when Earth's axis is neither pointed toward nor away from the Sun
11. the spinning motion of an object