4 The constant cycling of water through the processes of : Evaporation&Condensation.condensa tioWater is constantly changing from(gas liquid)and back again. This driven by the sun’s energy.
5 Sources of Fresh Water Lakes, ponds and wetlands Streams and rivers Ground waterRun OffGlaciers
6 Glaciers...A moving mass of snow and ice.Found in areas where it is so cold the snow remains all year.
7 Glaciers Almost 66% of all fresh water on Earth is in glaciers Glaciers form from layers of snow falling over many yearsGlaciers melt slowly under their own weight, and slowly flow downhillGlaciers cover about 10% of the Earth’s surfaceAlpine glaciers (aka valley) found in mountainsContinental glaciers (aka ice sheets) cover huge areas of land.Eg. Greenland and Antarctia(c) McGraw Hill Ryerson 20077
8 Glaciers in mountains and on the continent of Antarctica
9 reach an ocean, where crevasses open and icebergs fall off Glaciers slow down the Water Cycle by storing big amounts of frozen fresh water. Some water thaws in the hot summer months.They give us information about the Earth’s past climates. ( samples)Glaciers flow until theyreach an ocean, where crevasses open and icebergs fall off