Earth's outer layer is known as the crust. This layer is relatively thin compared to Earth’s other layers, composed primarily of silicate rocks and minerals. The crust is divided into several tectonic plates that float on the semi-fluid asthenosphere beneath it. It plays a crucial role in supporting terrestrial life and is the medium in which geological processes, such as erosion, sedimentation, and earthquake generation, occur. Understanding the crust is essential in studies related to geology, environmental science, and natural resource management.