Transcript Water Bubbles Template

Earth’s Water
2.2 identify and locate major land masses and bodies of water
• 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
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.
• 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.
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.
Seas, Gulfs, and Bays
• Large bodies of salt water
partially enclosed by land
comprise seas, gulfs, and bays.
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
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.
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.
• Because rivers and streams
flow through land, they carry
freshwater to people and
animals.
• Most people and animals live
near sources of freshwater.
Groundwater
• Ground water is freshwater
lying beneath the planet’s
surface.
• Natural springs and handmade
wells allow people to retrieve
groundwater.