Basically gravel is a mixture of sand and stone. It can be limestone, quarz or granite. Gravel comes is many shapes and colors. Gravel is dug up from sand mines or broken down in quarrys. Sand mine and rock quarrys are areas where there are large quantities of gravel and stone close the earths surface.
What is gravel used for?
The purpose of gravel is almost endless. Gravel is used for gardening, access routes, footpaths, terracing paving, casting and much more.