1. Origins of a Lake

2. I. General Information
Definition: A large body of water occupying an inland basin of a low-lying landmass
Lakes cover only about 1% of the continents (0.013% of the world’s water)
Extremely varied in the origins, size, shape, depth, chemistry and other features

3. Different Sizes
Large Lakes
Small Lake

4. Irregular Shaped Lakes
Different shapes
Irregular Shaped Lakes
Round Lakes

5. Different Chemistries
Very Salty
Fresh and Clear

6. An Earthquake caused a landslide dam forming Lake Serez
II. How a Lake is Formed
Lakes are constantly being formed and destroyed
An Earthquake caused a landslide dam forming Lake Serez

7. 1. Tectonic Activity
Tectonic shifts can cause land to change shape and block waterways forming the lake.

9. Glacier carves massive chunks from the land.
2. Glacial Activity
Glacier carves massive chunks from the land.
Melted glacier and tributaries fill the huge holes.

10. Finger Lakes - New York State

11. Devil’s Lake - Wisconsin

12. Caldera Lake – a lake where the opening of a volcano once existed
3. Volcanic Activity
Caldera Lake – a lake where the opening of a volcano once existed

13. Spirit Lake BEFORE Mt. St. Helen eruption
Spirit Lake AFTER Mt. St. Helens erupted

14. Man – Made Damns create lakes in flood plains
4. Man – Made Activity
Man – Made Damns create lakes in flood plains