Transcript Lakes - Tartu Veeriku Kool

Lakes
Lake
• A lake is a body of water which is inland,
not part of the ocean, is larger and deeper
than a pond, and is fed by a river.
Saimaa
Lakes
• Most lakes have a natural in the form of a
river or stream, but some do not and lose
water solely by evaporation or
underground seepage or both.
Lake Chad
Aral Sea
Aral Sea
Former Aral Sea
Caspian Sea
Lake Eyre
Salt lakes
• Salt lakes can form where there is no
natural outlet or where the water
evaporates rapidly and the drainage
surface of the water table has a higherthan-normal salt content.
Great Salt Lake
Lake Balkhash
Types of lakes
• Types of lakes by basin formation
Rift lakes
• A rift lake is a lake formed as a result of
subsidence related to movement on faults
within a rift zone, an area of extensional
tectonics in the continental crust.
• They are often found within rift valleys and
may be very deep.
Baikali järv
Tanganjika järv
Lake Superior
Crater lake
• A lake which forms in a volcanic caldera or
crater after the volcano has been inactive
for some time
Lake Toba
Crater Lake in Oregon
Maar lake in Germany
Glacial lake
• A glacial lake is a lake with origins in a
melted glacier
• Most Estonian lakes are glacial lakes
The Great Lakes
Lake Peipsi-Pihkva
Lake Ladoga
Oxbow lake
• A lake which is formed when a wide
meander from a stream or a river is cut off
to form a lake
Oxbow lake
Meanders and oxbow lakes on the Nowitna River, Alaska
Thermokarst lakes
• A body of freshwater, usually shallow, that
is formed in a depression by meltwater
from thawing permafrost
Thermokarst lakes
Artificial lake
• A lake created by flooding land behind a
dam
Subglacial lake
• A subglacial lake is a lake under a glacier
Lake Vostok