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Transcript
4 Types of Mountains
fault-block
volcanic
upwarped
folded
Mountain Age
Older mountains- not as high; rounded;
may have stopped forming
Younger mountains- high and rugged; still
forming
Fault Block Mountains
Sierra Nevada in California
Teton Range in Wyoming
See page 300
Huge blocks of rock are separating from
surrounding rock; jagged peaks
Rock layers are being pulled from opposite
directions and the blocks slide downward.
Sierra Nevadas
Grand Teton Mountains
Folded Mountains
Two plates push together and squeeze
rock layers which cause rocks to buckle
and fold.
Appalachian Mountains are an example.
North Am. and African plates converged
together
Appalachian Mountains
Upwarped Mountains
Southern Rocky Mountains
Black Hills in South Dakota
Forces inside Earth push up crust
The sedimentary rock layers will erode,
exposing the igneous or metamorphic rocks
underneath.
Black Hills
Southern Rocky Mountains
Volcanic Mountains
Washington’s Mount Saint Helens
Some volcanic mountains are caused by
subduction zones where convergent boundaries
form. The oceanic plate sinks under the
continental plate.
Some volcanic mountains are caused by hot spots
(Hawaiian Islands)
Mount Saint Helens
Hawaiian Islands
Volcanoes-- formed from hot spots
Other types of uplift
 Isostasy- the principle that states the Earth’s
lithosphere floats on a plasticlike upper part of the
mantle, the asthenosphere.
 As mountains continue to grow they, they sink down
deeper into the mantle.
 As mountains erode, the mountain rises again because
the weight has been removed.