By Emma & Natalie
Mountains are formed by very large forces in the earth. The formation takes anywhere from 1 million to 100 million years. Mountains come in two major families: volcanic mountains and tectonic mountains. Tectonic plates: The earth is made up of 30 tectonic plates. Mountains are formed when the tectonic plates crash into each other.
Forms when molten rock erupts and piles up on the surface. Consits of igneous rock, sedimentary rock, and metamorphic rock. Volcanic mountains are one of the two major mountain families; the other is tectonic mountains.
Result from geological forces that raise or fold earth's crust or otherwise change the shape. Some of these mountains form when the plates collide or pull away from one another. Other tectonic mountains form from the lifting and wearing down from earth's crust. Tectonic mountains are divided into these main families: 1. fold-thrust mountains 2. fault-block mountains 3. dome mountains 4. erosion mountains
Fold-thrust mountains form when 2 plates collide head on. When they crash, the plates edges crumple and some layers are shot over the others. Fold-thrust mountains are made mostly of sedimentary rocks, such as limestone, and shale.
Fault-block mountains form when plates pull apart or 'rift'. Stretching earth creates normal faults. Chunks of crust are pushed up against the faults while regions right next to these chunks become basins. Fault-block and fold-thrust mountains can form along strike strip faults (places where chunks of rock slide past each other.... sideways. )
THE END!!!!!!!!!!! HOPE YOU LEARNED SOMETHING NEW!!!!????