What is gravel primarily composed of?

Gravel is primarily composed of small, loose particles, including pebbles and stones. These particles are typically formed from the weathering and erosion of larger rocks, resulting in a material that can vary in size from fine gravel, which is closer to the size of sand, to larger stones. The mixture of these rounded or angular fragments makes gravel particularly useful in construction, landscaping, and drainage applications due to its excellent properties for drainage and stability.

While sand and clay can certainly be present in the environment, they do not define gravel. Similarly, soil and silt refer to finer particles and organic matter is derived from decomposed plant and animal material, neither of which accurately describes the composition of gravel. Thus, the focus on pebbles and stones accurately captures what gravel is comprised of, making it the correct choice.