Mountains Mt. Everest ( 29, 035 ft. or 8, 850 m ) Is the tallest mountain in the world…..
What is a Mountain? • A large mass of rock or landform that rises a great distance above its base (about 300 meters)
Where do mountains form? • Generally, along convergent plate boundaries: (Collision)
How do mountains form? • Mountains form from rocks that have been permanently deformed under stress.
What is the Tallest Mountain in the United States? Mount McKinley, Alaska with an elevation of 20, 320 feet or 6194 meters
3 Types of mountains: • Folded Mountains • Dome Mountains • Fault-block Mountains
1) Folded Mountains formed by the folding of rock layers during plate collisions EX. Appalachian Mountains
Types of folds in Rock • Anticline Upward fold • Syncline Downward fold
2) Dome Mountain a circular folded mountain, Formed by UPLIFT EX. Adirondack Mountains
3) Fault-Block Mountains formed when normalfaults uplifta block of rock EX. Sierra Nevada Mountains
Fault-Block Mountains Teton Mountain Range, Wyoming
A reverse fault occurs when the hanging wall moves up (Convergent Boundaries push rocks up and over) A normal fault occurs when the hanging wall moves down (Divergent Boundaries release tension and rocks slide down)
How is a thrust fault formed? • A thrust fault is formed when compressive stresses act over great distances. • A thrust fault is a reverse fault in which the fault plane dips 45 degrees or less from the horizontal.
What type of fault occurs when rock on opposite sides of a fault plane move horizontally past each other? A Strike-slip Fault
How do Horsts and Grabens differ? Horstsare large blocks of crust that have been thrust upward between faults… Grabens are large blocks of crust that have dropped down between faults…
There are also underwater mountains: Seamounts • Ships use SONAR to make 3-D images of underwater features