earths water 2.2 identify and locate major land masses and bodies of water
TRANSCRIPT
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Earth’s Water
2.2 identify and locate major land masses and bodies of water
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• The Caspian Sea in southeastern Europe/southwestern Asia is actually a salt lake–the largest one on Earth. It is a lake, not a sea, because it is surrounded by land. The ancient Romans called the Caspian a sea because its water was salty. Australia’s Lake Eyre, Venezuela’s Lake Maracaibo, and Utah’s Great Salt Lake are other notable saltwater lakes
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The Water Cycle
• The part of the earth that is covered by water is called the hydrosphere.
• Most of the hydrosphere is salt water, found in the oceans, seas, and some lakes.
• The rest of the hydrosphere is the freshwater of lakes, rivers, and springs.
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• The sun’s heat evaporates water, which remains in the air until the air cools.
• The cool air returns the water to Earth in the form of rain, snow, or sleet.
• The total volume of the hydrosphere remains relatively constant because the evaporated water returns to Earth as precipitation.
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Bodies of Salt Water Oceans
• About 97 percent of the hydrosphere is a huge body of
salt water divided into four oceans: the Atlantic, the
Pacific, the Indian, and the Arctic Oceans.
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Seas, Gulfs, and Bays
• Large bodies of salt water partially enclosed by land comprise seas, gulfs, and bays.
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Ocean Water to Drinking Water
• Because of the great demand for drinking water, people are experimenting with desalination–the removal of salt from ocean water.
2.4 explain the significance of water as a renewable resource
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Bodies of Freshwater
• Only about 3 percent of the hydrosphere is freshwater, and most of it is frozen in glaciers and icecaps, inaccessible to people.
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Lakes, Streams, and Rivers
• A lake is a body of freshwater completely surrounded by land. Only a few lakes are made of salt water.
• Streams are narrow bodies of water flowing through areas of land. Rivers are large streams that carry greater volumes of water.
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• Because rivers and streams flow through land, they carry freshwater to people and animals.
• Most people and animals live near sources of freshwater.
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Groundwater
• Ground water is freshwater lying beneath the planet’s surface.
• Natural springs and handmade wells allow people to retrieve groundwater.
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