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Ch. 25.2

Earth's Moon

QuestionAnswer
How long does it take the moon to orbit Earth (revolution)? 27.3 days; about a month
How long does it take the moon to rotate or spin on its axis? 27.3 days; about a month
Maria darkened regions of the moon made from cooled lava.
Highlands light colored, mountainous regions of the moon
Craters the main feature on the moon; bowl-shaped depressions caused by meteor impact.
How long does it take the moon to cycle through its phases? 29.5 days; or about a month
Phases of the moon where the visible part seems to be growing or increasing? waxing
Phases of the moon where the visible part of the moon appears to be shrinking: waning
New moon Phase of the moon which is not visible from Earth b/c the lit 1/2 is not facing Earth.
Full moon Phase of the moon in which the entires lit 1/2 is visible from Earth.
Solar eclipse When the sun gets blocked from the Earth by the moon.
Lunar eclipse When the moon gets darkened by Earth's shadow.
Umbra The direct shadow cast during an eclipse. Total eclipses are visible when the moon or Earth is present in this location.
Penumbra Partial eclipses are visible when the Earth ro moon is in this location.
Tidal bulge high water level facing the moon due to the moon's gravitational pull on Earth.
Spring tides Bigger tides which happen during new and full moon phases.
Neap tides Weaker tides that happen during quarter moon phases.
Created by: burnsie
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