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Lakes and Ponds

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differences on lakes and ponds - middle school – PowerPoint PPT presentation

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Title: Lakes and Ponds


1
Lakes Ponds
write everything in yellow
  • Mrs. Wisher

2
Lakes Ponds Whats the difference?
  • Lakes are large bodies of water that are within a
    land mass
  • Ponds are within land but smaller than lakes

3
What Classifies Ponds?
  • Ponds are more shallow
  • Sunlight reaches the bottom of ponds
  • Ponds have muddy bottoms that support plant
    growth
  • Some ponds are seasonal

4
Pond Life
  • Algae live in ponds which produce food for other
    animals
  • Frogs, small fish, snails and crayfish all live
    within a pond

Blue-green algae
5
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?

6
What Classifies 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

7
Lake Formation
  • Lakes can be formed from
  • glaciers
  • oxbow
  • volcanoes
  • reservoirs for human use

8
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

9
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

10
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

11
Wetland
  • A wetland is a shallow swampy area that can
    sometimes evaporate during warmer weather

12
POP QUIZ!!!
13
1. How was this lake formed?
14
2. How was this lake formed?
15
3. What type of lake is this?
16
4. Name 2 features of a pond.
17
  • 5. In the winter, is water warmer or cooler at
    the bottom of a lake?

18
1. How was this lake formed? GLACIERS!
19
2. How was this lake formed? Volcano!
20
3. What type of lake is this? Reservoir!
21
4. Name 2 features of a pond.
  • Shallow
  • muddy bottoms
  • sunlight reaches the bottom
  • seasonal
  • plant growth on bottom

22
  • In the winter, is water warmer or cooler at the
    bottom of a lake?
  • WARMER!
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