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Sun, Moon, Earth
Chapter 12 Vocabulary
| Term | Definition |
|---|---|
| law of universal gravitation | every object in the universe attracts every other object, depending on their masses and distances from one another |
| solstice | the two days of the year in which the sun's most direct rays reach farthest north or farthest south |
| equinox | the two days of the year when day and night are almost the same length everywhere on earth |
| crescent | the moon phase in which less than half of the moon's sunlit side is visible |
| gibbous | the moon phase in which more than half, but not all, of the moon's sunlit side is visible |
| wax | to grow |
| wane | to shrink |
| lunar eclipse | an event that occurs when Earth passes directly between the sun and the moon, causing the moon to be temporarily "eclipsed" or hidden |
| solar eclipse | an event that occurs when the moon passes directly between the sun and Earth, causing the sun to be temporarily "eclipsed" or hidden |
| tide | the periodic rising and falling of the surface level of ocean water |
| spring tide | a condition of the greatest difference between low and high tides |
| neap tide | a condition of the LEAST difference between low and high tides |
| revolution | the movement of going around an object |
| rotation | the movement of spinning on an axis |
| mass | a measure of how much matter is within an object; greater the mass, the greater the gravity of an object |
| axis | an imaginary line that Earth spins on at a 23.5 degree angle |
Created by:
lrpsalter
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