1. Lakes & Ponds
Mrs. Wisher

2. Ponds Ponds are more shallow Sunlight reaches the bottom of ponds
Ponds have muddy bottoms that support plant growth
Some ponds are seasonal

3. Pond Life Algae live in ponds which produce food for other animals
Frogs, fish, snails and crayfish all live within a pond
Blue-green algae

4. Ponds In many northern states, ponds will freeze during winter
Fish and plant life can live under frozen water due to the warmer temperatures
Why does only the surface of the pond freeze?

5. Lakes Lakes are deeper and larger than ponds
Sunlight does not reach the bottom of lakes
The bottom of lakes are either sand or rocks

6. Lakes & Ponds What’s the difference?
Lakes are large bodies of water that are within land
Ponds are smaller than lakes

7. Lake Formation Lakes can be formed from: glaciers oxbow volcanoes
reservoirs – for human use
How was this lake formed?

8. How was this lake formed?

9. Lake Habitats Close to shore, lake habitats are like ponds
Few organisms live at the bottom of lakes
mostly worms & mollusks
Large bony fish live in the deep waters of a lake
eat what floats to the bottom

10. Lake Turnover Most lakes change with the seasons
Lake turnover happens in the winter when the warmer water cools and sinks to the bottom causing the water & nutrients to mix

11. Eutrophication Algae feed on waste products from other animals
Over time more algae grows and covers a lake in a thick green scum which blocks out sunlight
Plants die and the lake is starved of oxygen
The lake becomes shallower and will eventually disappear

12. Wetland
A wetland is a shallow swampy area that can sometimes evaporate during warmer weather