Presentation on theme: "Distribution of Earth’s Water"— Presentation transcript:
1 Distribution of Earth’s Water The OceansWater covers about 75% of the Earth’s surface97% is salt water3% is fresh wateronly 1% of fresh water can be usedThere are 4 major bodies of water:Atlantic OceanPacific OceanIndian OceanArctic Ocean
2 Ice - 76% of fresh water Most of Earth’s fresh water is locked in thick sheets of ice near the North and South Poles Icebergs – huge chunks of floating ice made of fresh water.Rivers and Lakes.34% of fresh waterVery little fresh water but important to people who live near them.Groundwater- 23% of fresh water (shallow and deep combined)- Water fills the cracks and spaces in underground soil and rock layers.
3 Surface Water River Systems Pond a. Tributary – streams and smaller rivers that feed into a main riverb. Watershed – land area that supplies water to a river system.c. Divide – separates one watershed from another by a ridge of landPonda. Body of fresh, standing waterb. Smaller than lakes – sunlight reaches the bottomc. Formed when water collects in hollows or low-lying areas of landd. Home too many animals including frogs, crayfish, sunfish, water lilies, algae, etc.
4 Lakes - Body of fresh water that no sunlight reaches the bottom - Deep and big - Formed two ways Same as a pond Powerful forces that shape Earth’s surface such as ice depressions, crust movement or volcanoesWetlands – a land area that is covered with water during part or all of the year.3 typesMarshes – grass covered by shallow waterSwamps – flooded forests with trees – usually in warm, humid climatesBogs – depression from ice sheets – usually in cold climates
5 Water Underground Movement Zones Permeable – water runs through the groundGravelImpermeable – water cannot pass through easilyClayGraniteZonesSaturated – soil is totally filled with waterUnsaturated – soil can still accept water
6 Ground waterSprings – ground water bubbles or flows out of cracks in rock to Earth’s surfaceAquifer – underground rock or sediment that holds waterWell – channel dug into an aquifer to provide a supply of waterGeyser – hot spring from which water periodically erupts out
7 Using Freshwater Resources How People Use Fresh WaterHousehold purposesIndustryTransportationAgricultureIrrigation – supplying water to areas of land to make them suitable for growing cropsRecreation
8 Conserving Water Reduce Recycle Reuse Pollution – addition of any substance that has a negative effect on water or the living things that depend on the water