EARTH'S SURFACE

The core, mantle and crust make up the three layers of the Earth. The crust is the outermost layer. A variety of compounds are found in the earth's crust. As a result of weathering, the minerals from rocks are found in the earth's crust. A major portion of the earth's crust is the ocean floor making it difficult to study. The crust is composed mostly of inorganic minerals and rocks. The crust is the source of nearly all nonrenewable resources we use--fossil fuels, metals and nonmetals. The crust is also the source of all the elements that make up our bodies. The crust is also the source of soil.