Question

some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. is it likely that these rocks were present when earth was first formed?

a. no, it is likely that any rocks older than a few hundred years are meteorites from outer space.

b. yes, the oldest rocks on earth were likely some of the rocks present when earth was first formed.

c. no, rock material is constantly recycled on earth as rock is melted into magma.

d. yes, most of the rocks on earth can be dated back to the time when earth was first formed.

Explanation:

The rock - cycle shows that rocks are constantly recycled. Rock material is melted into magma, and new rocks are formed through processes like crystallization, weathering, and lithification. So, it is unlikely that the oldest rocks found were present when Earth was first formed.

Answer:

C. No, rock material is constantly recycled on Earth as rock is melted into magma.