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 Ponds have muddy bottoms that support plant growth Some ponds are seasonal What Classifies Ponds?
Algae live in ponds which produce food for other animals Frogs, small fish, snails and crayfish all live within a pond Pond Life Blue-green algae
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?
Lakes are deeper and larger than ponds Sunlight does not reach the bottom of lakes The bottom of lakes are either sand or rocks What Classifies Lakes?
Lakes can be formed from: • glaciers • oxbow • volcanoes • reservoirs – for human use Lake Formation
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 Lake Habitats
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 Lake Turnover
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 Eutrophication
A wetland is a shallow swampy area that can sometimes evaporate during warmer weather Wetland
4. Name 2 features of a pond. • Shallow • muddy bottoms • sunlight reaches the bottom • seasonal • plant growth on bottom