The First Layer- The Crust
The outermost surface of the earth is called the crust.
It is not as thick as the other layers, but its about 25 miles long. Since it is not that thick, the crust is very thin and brittle. The Earth's crust also extends under the oceans, as well as the continents.
http://www.thetech.org/exhibits_events/online/quakes/inside/crust.html
It is not as thick as the other layers, but its about 25 miles long. Since it is not that thick, the crust is very thin and brittle. The Earth's crust also extends under the oceans, as well as the continents.
http://www.thetech.org/exhibits_events/online/quakes/inside/crust.html