How often is Earth's surface being changed? 1 every hundred years
2 never
3 at all times
4 once a year

I believe it is 3.

Explanation:

because the earth is constantly shifting.

elements make up everything, and they combine to make compounds.

the answer is c

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.