Question

an aggregate is one type of land resource. what is an aggregate? a layer of solid rock found beneath soil the top layer of soil a natural mixture of sand, gravel, and crushed stone a naturally occurring mineral or rock

Explanation:

Aggregates are composed of sand, gravel, and crushed stone, which are natural materials used in construction and as land - resources. The other options describe different geological features like bedrock, top - soil, or minerals/rocks in general.

Answer:

C. a natural mixture of sand, gravel, and crushed stone