Fold Mountains and Ocean Trenches

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where are ocean trenches found?
ONLY at destructive plate boundaries
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where are fold mountains found?
destructive and collision (two continental plates collide together) plate boundaries
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describe the location of ocean trenches (2 marks)
destructive plate boundaries (e.g. S.America and Nazca) often next to fold mountains
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how are fold mountains formed?
Rivers carry sediment into a depression (geosyncline). Deposits in thick layers - millions of years = sedimentary rock. Pates move together and rock is forced upwards = synclines and antisynclines.
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how are ocean trenches formed?
the point where an oceanic plate is sub-ducted underneath a continental plate at a destructive plate boundary
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what are the problems with fold mountains?
Cold climate - avalanches. Steep relief. High altitude. Poor quality soil. Inaccessible.
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what do people use fold mountains for?
Farming. Grazing cattle. Tourism. Dams (HEP's). Forestry. Mining.
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how do people farm on fold mountains?
(Andes) Terraces are cut - flat, retain the little water the area receives, reduces downwards movement of soil (mainly subsistence farming)
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what cash crops do people grown on fold mountains in the Andes?
soybeans, rice and cotton
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why is the Andes used for mining?
has a range of important minerals
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what does the Andean countries rank in the top 10 for?
tin (Perua and Bolivia), nickel (Colombia), silver (Peru and Chile) and gold (Peru)
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what is the largest gold mine in the world?
Yanacocha
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why are fold mountains good for HEP?
steep slopes and narrow valleys - easier to dam and rapid fall of water to generate electricity
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what is an example of a HEP project?
the Yuncan project
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why do fold mountains (Andes) attract tourists?
natural attractions - mountain peaks, volcanoes, glaciers and lakes. Remains of early settlements - Machu Picchu built by the Incas and the Inca trail
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Card 2

Front

where are fold mountains found?

Back

destructive and collision (two continental plates collide together) plate boundaries

Card 3

Front

describe the location of ocean trenches (2 marks)

Back

Preview of the front of card 3

Card 4

Front

how are fold mountains formed?

Back

Preview of the front of card 4

Card 5

Front

how are ocean trenches formed?

Back

Preview of the front of card 5
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