The Chilean miners reached a depth of about 2,300 feet (700 meters) below the surface of the Earth. This puts them in a layer called the crust, which is the outermost solid layer of the Earth. The crust is relatively thin compared to the other layers, making up only about 1% of the Earth's volume. It consists of rocks and minerals and is divided into two main types: the continental crust, which makes up the continents, and the oceanic crust, which forms the ocean basins.
