Sand is made up of bits of rock and the remains of organisms called sediments.

Here's a breakdown:

* Rock fragments: These are small pieces of rocks that have been broken down by weathering and erosion.

* Remains of organisms: This includes the shells, bones, and other hard parts of marine creatures like clams, corals, and sea urchins. It also includes microscopic organisms like diatoms.

These sediments are transported by wind, water, and ice, and eventually settle in different places, forming sand.