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Ch 20

vocabulary

TermDefinition
equator imaginary line that divides Earth into its northern and southern hemispheres
equinox day when Earth’s axis is not leaning toward or away from the Sun
orbit path an object follows as it moves around another object
revolution motion of an object around another object
rotation spinning motion
rotation axis line on which an object rotates
solstice day when Earth’s rotation axis is the most toward or away from the Sun
maria large, dark, flat areas on the Moon
phase lit part of the Moon or a planet that can be seen from Earth
waning phase occurs when less of the Moon’s near side is lit each night
waxing phase occurs when more of the Moon’s near side is lit each night
lunar eclipse occurs when the Moon moves into Earth’s shadow
penumbra lighter part of a shadow where light is partially blocked
solar eclipse occurs when the Moon’s shadow appears on Earth’s surface
tide daily rise and fall of sea level
umbra central, darker part of a shadow where light is totally blocked
Created by: AWitczak
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