Lakes and Ponds

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Lakes Ponds
write everything in yellow

• Mrs. Wisher

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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

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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

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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
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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?

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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

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Lake Formation

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

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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

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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

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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

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Wetland

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

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

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1. How was this lake formed? GLACIERS!
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2. How was this lake formed? Volcano!
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3. What type of lake is this? Reservoir!
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4. Name 2 features of a pond.

• Shallow
• muddy bottoms
• sunlight reaches the bottom
• seasonal
• plant growth on bottom

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