Chapter 19: Earth, Moon, & Sun

Front

How large is the moon compared to Earth?

Back

about one fourth the diameter of the Earth

Front

How do scientists think the moon was formed?

Back

A large object struck Earth, and material from both bodies combined.

Front

What did Galileo think the dark, flat parts of the moon's surface were?

Back

oceans

Front

What are the round pits on the moon's surface called?

Back

craters

Front

Much of what scientists know about the moon has come from: revolving around the moon, studying the moon through telescopes, astronauts walking on the moon, studying moon rocks gathered by astronauts

Back

studying moon rocks gathered by astronauts

Front

Instruments left on the moon to measure heat flow show that

Back

the moon's interior has cooled almost completely

Front

Photographs of the far (dark) side of the moon show that

Back

the far side is much rougher than the near side

Front

Maria are

Back

regions once flooded by molten material

Front

Earth's spinning on its axis is called its

Back

rotation

Front

Which event occurs once every 24 hours?

Back

The Earth rotates on its axis.