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L9: Geomorphology of Lakes & Wetlands: Origins & Kinds - Coggle…
L9: Geomorphology of Lakes & Wetlands: Origins & Kinds
~20 are >400m deep
deepest = 1635m (@ max depth)
< 2% of the Earth's surface
18% in Great Lakes
20% of world's fresh water = Lake Bikal (Siberia)
8 formation processes
Tectonic activity
Forms endemic flora and fauna
Quite isolated
Barely any immigration/emmigration
Rift lakes
Volcanic activity
Lava flows block fjords and valleys
Endemic flora and fauna
Landslides
Blocks valleys and traps water
Creates depression that fills with water
Glacial activity
Through ice deposition/corrosion
Kettle lakes
4 glaciations over >100,000 years
Covered more of Canada
Solution
Soluble rocks
e.g. CaCO3
River activity
Meandering
Oxbow lakes
Wind/shoreline activity
Cut off by winds, sand dunes etc.
Organic
Beavers
Humans
Reservoirs
Flood prevention
Drinking
Hydro
Storage
Agriculture
More in the USA
