22B Flashcards

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1
Q

Why is the moon a sphere?

A

Because of its slow rotation

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2
Q

The diameter of the moon is _______ km

A

3474

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3
Q

The moon has a _____, mantle, and crust.

A

Core

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4
Q

How do we know about the moon’s interior?

A

Because Apollo astronauts left a seismometer there and it measures moonquakes

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5
Q

True or false: the moon has almost no atmosphere

A

True

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6
Q

How does the moon’s small atmosphere get replenished?

A
  1. Gases from the interior

2. Gases from small particles on the surface

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7
Q

Circular depressions on the moon’s surface are called _______

A

Craters

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8
Q

Who first discovered the moon’s craters with a telescope?

A

Galileo

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9
Q

What formed craters?

A

The impact of meteors and asteroids slamming into the moon

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10
Q

How did rays around certain craters form?

A

From the material underneath what was blasted out of the crater

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11
Q

Materials that are blasted out of a crater are called _______

A

Ejecta

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12
Q

Lunar seas, which are large depressions in the moon, are called ______

A

Mare or Maria

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13
Q

The largest mare is Mare _________

A

Imbrium

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14
Q

True or false: the moon has mountains, extinct volcanoes, and valleys

A

True

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15
Q

A narrow valley on the moon is called a _______

A

Rille

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16
Q

True or false: the lunar seas, or mare, are broad plains of frozen ice

A

False

17
Q

_______ rilles were formed from collapsed lava tubes

A

Sinuous

18
Q

________ rilles were formed as grabens in rift valleys

A

Straight

19
Q

The moon is the earth’s only natural ________

A

Satellite

20
Q

_________ rilles formed when flood basalts in mare basins cooled and shrank away, creating gaps

A

Arcuate

21
Q

The Hadley Rille is a ______ rille

A

Sinuous