The main component in the Earth's crust is silica, primarily found in the form of silicon dioxide (SiO₂). Silica is a major constituent of many rocks, including granite and sandstone. The Earth's crust is made up of various types of rocks and minerals, with silica-rich minerals known as silicates being the most abundant. These silicates include feldspar, quartz, and mica, among others. The composition of the crust varies from one location to another, but silica remains a fundamental constituent, contributing to the geological diversity observed on the planet's surface.