2 Salt Water Oceans contain 97% of the earth’s water The Pacific Ocean is the largest and the deepestOther bodies of salt water include seas, gulfs, and bays – these bodies of salt water are often partially enclosed by land
3 Salt WaterEven though the earth’s surface is 70% water having enough drinking water is still a major concern for the world because salt water in its natural form is not fit for consumptionDesalination – a process for turning salt water into freshwater by removing the salt.Desalination is still in the process of being improved and is very expensive. Only countries in desperate need of freshwater currently use this process.
4 Fresh Water Only 3% of the earth’s water supply is freshwater. More than 2% of the earth’s water supply is frozenAnother 0.5% is found under the earth’s surfaceLakes, streams, and rivers contain less than 1% of the earth’s water
5 Fresh Water Lake – a body of water completely surrounded by land Most lakes were created by glacial erosion
6 Fresh Water Streams and rivers are made up of flowing water. The place where a river empties into another body of water is called the mouth.Although lakes, rivers, and streams make up a small percentage of the earth’s water they help with transportation and as a source of water for people
7 GroundwaterGroundwater is freshwater that lies under the earth’s surfaceComes from rain and melted snow that filter through the soil and from water that seeps through the ground from lakes and rivers.Wells and springs tap into groundwaterAquifer – an underground layer of soft rock that is saturated with water