what layers contain what parts
Heavier elements like iron tend to sink toward the center or core of the earth. Lighter materials, the silicates, oxygen compounds and water have risen to become part of the crust. This action has created distinct layers within the earth and is still in process today. The Inner Earth is composed of three main parts; the crust, the mantle, and the core as shown in the diagram of the earth's interior below: The Crust - silicate rocks, primarily granite and basaltOceanic Crust - mostly basaltContinental Crust - igneous, metamorphic, and sedimentary rocks.