Across section of rock, shows a sequence of
sedimentary rocks, with the oldest rocks on
| the bottom and the youngest on top.

Primary rocks

Explanation:

the answer u all are looking for is 4000000000000000000000 million years.

true skin; another name for the dermis. lies directly beneath the epidermis and is often referred to as the true skin. outermost layer of epidermis, consisting of dead cells.