What is the distance of the first layer of earth?

The Earth's first layer, known as the crust, varies in thickness depending on whether it's continental or oceanic. Continental crust averages about 30-50 kilometers (19-31 miles) thick, while oceanic crust is generally around 5-10 kilometers (3-6 miles) thick. This layer is the outermost part of the Earth, sitting above the mantle.