A student is studying Earth's layers. She is trying to determine how temperature and density change from one layer to another. Which relationship that exists between Earth's layers did the student most likely find?

A. The temperature of Earth's layers decreases with depth, while density increases with depth.

B. The temperature of Earth's layers increases with depth, while density decreases with depth.

C. The temperature and density of Earth's layers decrease with depth.

D. The temperature and density of Earth's layers increase with depth.