Lakes & Ponds
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Lakes & Ponds Mrs. Wisher write everything in yellow
description
write everything in yellow. Lakes & Ponds. Mrs. Wisher. Lakes & Ponds What’s the difference?. Lakes are large bodies of water that are within a land mass. Ponds are within land but smaller than lakes . Ponds are more shallow Sunlight reaches the bottom of ponds - PowerPoint PPT Presentation
Transcript of Lakes & Ponds
Lakes & Ponds
Mrs. Wisher
write everything in yellow
Lakes & Ponds What’s the difference?
Lakes are large bodies of water that are within a land mass
Ponds are within land but smaller than lakes
What Classifies Ponds?Ponds are more shallowSunlight reaches the bottom of pondsPonds have muddy bottoms that support plant growthSome ponds are seasonal
Pond LifeAlgae live in ponds which produce food for other animalsFrogs, small fish, snails and crayfish all live within a pond
Blue-green algae
PondsIn 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?
What Classifies Lakes?Lakes are deeper and larger than pondsSunlight does not reach the bottom of lakesThe bottom of lakes are either sand or rocks
Lake FormationLakes can be formed from:
glaciersoxbowvolcanoesreservoirs – for human use
Lake HabitatsClose to shore, lake habitats are like pondsFew organisms live at the bottom of lakes
mostly worms & mollusksLarge bony fish live in the deep waters of a lake
eat what floats to the bottom
Lake TurnoverMost lakes change with the seasonsLake turnover happens in the winter when the warmer water cools and sinks to the bottom causing the water & nutrients to mix
EutrophicationAlgae feed on waste products from other animalsOver time more algae grows and covers a lake in a thick green scum which blocks out sunlightPlants die and the lake is starved of oxygenThe lake becomes shallower and will eventually disappear
WetlandA wetland is a shallow swampy area that can sometimes evaporate during warmer weather
POP QUIZ!!!
1. How was this lake formed?
2. How was this lake formed?
3. What type of lake is this?
4. Name 2 features of a pond.
5. In the winter, is water warmer or cooler at the bottom of a lake?
1. How was this lake formed? GLACIERS!
2. How was this lake formed? Volcano!
3. What type of lake is this? Reservoir!
4. Name 2 features of a pond.
Shallowmuddy bottomssunlight reaches the bottomseasonalplant growth on bottom
5. In the winter, is water warmer or cooler at the bottom of a lake?
WARMER!
