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Chapter 19
6th grade
Term | Definition |
---|---|
axis | an imaginary line that passes through Earth's center about which it rotates |
rotation | the spinning motion of a planet on its axis |
revolution | the movement of an object around another object |
orbit | the path an object takes as it revolves around another object in space |
solstice | the two days of the year on which the sun reaches its greatest distance north or south of the equator |
equinox | the two days of the year on which neither hemisphere is tilted toward or away from the sun |
solar eclipse | the blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth |
lunar eclipse | the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon |
umbra | the darkest part of a shadow |
penumbra | the part of a shadow surrounding the darkest part |
maria | dark, flat areas on the moon's surface formed from huge ancient lava flows |
crater | a large round pit caused by the impact of a meteorite |