Third Grade
Worksheets
Sand and Gravel
Sand and gravel are natural resources. They come from larger rocks. Weathering causes pieces of larger rocks to break off. These small pieces of rock become sand or gravel. Sand is smaller than gravel. Rocks to make sand and gravel can also be dug out of the ground at a quarry. Then the rocks are taken to a processing plant where they are crushed into smaller pieces. Both sand and gravel are very important. They have many surprising everyday uses. Sand and gravel are the main ingredients in concrete. Concrete is used to build buildings and highways in .....
