Question

question 8 of 10
what is the primary evidence used to determine how the moon formed?
a. moon rocks and earth rocks are made up of many of the same materials.
b. moon craters and earth craters were caused by the same asteroid strike.
c. the moon and earth are exactly the same age.
d. the moon and earth have similar atmospheres.

Explanation:

The leading theory of Moon - formation is the giant - impact hypothesis. Moon rocks and Earth rocks having many of the same materials support the idea that the Moon formed from debris ejected when a Mars - sized body collided with Earth. Craters being caused by the same asteroid strike is not the primary evidence. The Moon and Earth are not exactly the same age, and the Moon has a very thin exosphere while Earth has a dense atmosphere, so similar atmospheres is incorrect.

Answer:

A. Moon rocks and Earth rocks are made up of many of the same materials.