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Types of Mountains

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Jasdeep Minhas

on 22 April 2010

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Transcript of Types of Mountains

Types of Mountains
Fold Mountains
-most common type
-largest mountain ranges are this type
-formed over millions of years
-when 2 plates collide head on and their edges crumble
-upward folds are called anticlines, downward folds are synclines
-Examples: Himalayan mountains (formed when India crashed into Asia)
The Alps
The Andes (formed by the collision of the South American plate and the Pacific plate
The Rockies
Urals Fault-Block Mountains
-formed when faults (cracks) in the earth's crust force or push some materials up and others down
-instead of folding over like a fold mountain, the crust fractures (pulls apart)
-breaks apart blocks of rock, which can move up and down and end up stacked on top of one another
-often have a steep front and sloping back
-Examples: Sierra Nevada mountains
Harz mountains Dome Mountains
-result of a great amount of magma pushing up under the earth's crust
-without erupting, the magma pushes up the above rock layers
-magma then cools and hardens
-called a dome because the uplifted area resembles the top half of a sphere
- because the dome is higher than the surrounding ground level,erosion from wind & rain occur at the top
Volcanic Mountains
-formed by volcanoes
-occur when magma erupts and piles upon the surface, cooling into a hardened rock
-this is repeated until there are many layers that form a cone-shaped mountain
Mount St. Helens
Mount Pinatubo
Mount Kea Mount Loa (Both in Hawaii)
Plateau Mountains
-formed by erosion
-plateaus are areas of high levels of flat land, either pushed up by forces within the earth, or formed by layers of lava
-often found near fold mountains
-over several years, streams & rivers erode valleys, leaving mountains standing in between
-mountains in New Zealand are examples By: Jasdeep & Lily
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