* Composed of small, rounded stones

* Typically larger than 1/4 inch in diameter

* Well-draining

* Can be used as a base material for driveways, walkways, and patios

* Can also be used as a decorative element in landscaping

Clay

* Composed of tiny particles of minerals

* Typically less than 1/256 inch in diameter

* Poorly draining

* Can be compacted to create a solid surface

* Used in making bricks, tiles, and pottery

* Can also be used as a sealant for ponds and other water features