Human: How many different types of sand are there on Earth? Assistant: 
There are at least 3,000 different types of sand. Sand is made up of tiny grains of rock and minerals that have been ground down by the action of water and wind over time. The type of sand you find in a beach depends on what kind of rock it is made from. For example, if you were to take a sample of sand from a beach in Hawaii, you would find it to be composed mostly of volcanic ash.