Jump to content

Draft:Block Mountains.

From Wikipedia, the free encyclopedia


   BLOCK MOUNTAINS

Block mountains are formed by the raising and tilting of large blocks of the Earth’s crust along fault lines. There are two different types of block mountain, the first being the tilted type, and the second, the lifted type.

Tilted and lifted block mountains are not too different, in fact they both have the same kinds of layers. Going from the top to the bottom the layers are, firstly, the scarp layer, secondly, the fault surface, and lastly, dirt, mud, and minerals that naturally reside in the Earth’s crust.

The main difference between tilted and lifted block mountains is their shape. Tilted mountains have one steep side and generally a rounded back. Imagine you took a book and held it on the floor at a 60-degree angle, now imagine drawing a rounded line from the top of the book to the floor, that would be the basic shape of a tilted mountain. Lifted mountains have two steep sides, picture two books leaned toward each other at a 70-degree angle, now picture a straight line connecting the two books, that is the basic shape of a lifted mountain, though generally the top surface of a mountain is not a perfectly flat line.
            The different layers of block mountains.

The scarp layer of both types of block mountain is the top layer and is usually at least most of the way above the surface. The fault surface is the layer right underneath the scarp layer, and offers support and stability to the mountain, it is made up of dirt and minerals that are more compressed and firmer than some regular layers of Earth. Underneath both the scarp and the fault layer is normal dirt and minerals that may vary depending on where the mountain is located.

References

[edit]

Geology, by Richard Cadice and Edward P. Ortleb. Milliken Publishing Co. 1986.