Maanpeitteiset

Maanpeitteiset, also known as the Earth's crust, is the outermost solid layer of the Earth. It is composed of various types of rocks and minerals, and it is the layer that humans inhabit and interact with. The thickness of the Earth's crust varies, ranging from about 5 kilometers (3 miles) beneath the oceans to over 70 kilometers (43 miles) beneath some mountain ranges. The crust is divided into several tectonic plates that float on the semi-fluid asthenosphere beneath. These plates move and interact with each other, leading to phenomena such as earthquakes, volcanic activity, and the formation of mountains and oceanic trenches. The Earth's crust is also home to a wide variety of geological features, including mountains, valleys, canyons, and plains. It is a dynamic and ever-changing layer that plays a crucial role in shaping the Earth's surface and supporting life. The study of the Earth's crust is a key focus of geology, and understanding its composition, structure, and processes is essential for comprehending the planet's history and future.