Question

Reese put gravel, sand, and clay in a bottle. She added some water, shook the bottle, and left it for an hour. What did she see after an hour?

Answer 1

Gravel settled at the bottom and clay settled at the top.

Answer 2

The heaviest material will settle at the bottom. The lightest material will settle at the top. Gravel is the heaviest.

so your answer will be Gravel settled at the bottom and clay settled at the top.