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Sun, Moon, Earth

Chapter 12 Vocabulary

TermDefinition
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
mare a dark, flat area on the moon's surface filled with hardened lava
revolution the movement of going around an object
rotation the movement of spinning on an axis
weight a measure of the pull of gravity on an object
mass a measure of how much matter is within an object
meteoroid a rock fragment from an asteroid or comet
crater a large round depression that has been created by the impact of a meteoroid
axis an imaginary line that Earth spins on at a 23.5 degree angle
Created by: lrpsalter