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Mountain Building (Different types of mountains are created by plate…
Mountain Building
Different types of mountains are created by plate motion and effect of plate motion, thus changing the positions of rocks and the rocks themselves
Fault-Block Mountains:
- formed where blocks of crust move up and down along faults
- parallel ridges
- found in Basin and Range Province in Western US
Folded Mountains:
- made of layers of rocks that are folded when rocks are under pressure, folds form instead of faults. Folded mountains form
- formed as continental plates collide , fold and uplift layers of rock, When erosion removes the upper crust, folds are exposed on the surface.
- folds are along a long ridge perpendicular to the direction of the compression
Uplifted Mountains:
- formed when large regions rise vertically with very little deformation
- Mt. Whitney is an example, granite top was once 10 km below Earth's surface
- Granite made of igneous rocks - rocks below Earth's surface. Exposed by Uplift and erosion
Volcanic Mountains:
- formed by molten rock from volcanoes
- example Hawaiian Islands
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Building Cycle
result of many different plat collisions over many millions of years
when plates collide at a plate boundary, a combination of faults, uplifts creates mountains
made of many different types of rock
When no compression at a convergent plate boundary, the mountain stop increasing in size
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2 types of mountains that can form far from plate boundaries are uplifted mountains and volcanic mountain
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the geniralizaton that mountainsonly form at convergent plate bondarys.explain how other prosseses can produse mountains
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When continents split at divergent plate boundary, continents break close to plate,
a rift forms and seawater flows into it to form ocean
When continents collide, new mountain ranges form on top of or next to older mountain ranges, and so the cycle goes. Result - Appalachian Mountains
Appalachian Mountains is old, stretches along East US
Not as high and rugged as the Rocky mountain
No longer growing
Weathering has rounded the peaks and lowered the elevations
Natural processes wear down mountains, smooth peaks and reduce height
Mountains last hundreds of millions of years due to isostasy
Isostasy is the process by which rocks under continents rise to Earth's surface as a mountain erodes, so the balance is restored
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