2. Lake
A depression on the surface of the earth, where water gets collected .
known as a lake.
3. Where does each lake type fall
on the line?
Low
nutrients
Very high
nutrients
4. Lake types
On the basis of its tropic status
Trophy = nutrient (phosphorus and
nitrogen )
1.Oligotrophic.
2.Mesotrophic.
3.Eutrophic.
5. low nutrients (P&N)
Clear water
Often steep sided and deep
Usually replenished by snow, glacier melt
Examples: Lake Tahoe, Crater Lake
Oligotrophic lakes
7. Eutrophic lakes
High nutrient levels
Murky, green water
Usually shallow.
Usually replenished by rivers/streams
8.
9. Cultural Eutrophication
We artificially cause lakes to become
eutrophic by
Runoff
Pollutants
Thermal pollution
Lakes become hypereutrophic
12. Volcanic lakeVolcanic lake
Associated with volcanic activity
Form when the shut off volcano will be filled with
water
Associated with volcanic activity
Form when the shut off volcano will be filled with
water
13. Glacier LakesGlacier Lakes
Formed when the surface is scoured, deepened and
widened by the glacier.
And the surface will be filled by glacier melt water
Formed when the surface is scoured, deepened and
widened by the glacier.
And the surface will be filled by glacier melt water
14. Salty LakesSalty Lakes
Cause by the limited supply of freshwater
Tendency to concentrate the water with minerals
Cause by the limited supply of freshwater
Tendency to concentrate the water with minerals
15. Artificial LakesArtificial Lakes
Manmade lakes
For water reservoirs, electricity generation, etc.
Manmade lakes
For water reservoirs, electricity generation, etc.