crustal composition

Crustal composition refers to the types of rocks and minerals that make up Earth's outer layer, known as the crust. It mainly consists of oxygen, silicon, aluminum, and other elements that form minerals like quartz, feldspar, and mica. These rocks vary between continents and ocean floors, with continental crust being thicker and made mostly of granite, while oceanic crust is thinner and primarily basalt. The crust is the Earth's outer shell, where landforms, soils, and many natural resources originate, providing essential materials for life and human activity.