Chapter 6 Lesson 4
Earth
 70
percent of the Earth’s surface is
covered with water.

•

3% of the Earth’s water is freshwater
Fresh Water is limited!!!
Water picks up salts from soil, rock,
sand, and volcanoes
 There

Sources of Freshwater
are three sources of fresh water
Running Water- water that is
constantly moving such as rivers or
streams
 Standing
Water- bodies of still water
such as lakes and reservoirs

Ground Water- water that seeps
underground through aquifers
How Do We Use Water
 1.
 2.
 3.
 4.
 5.
Thermoelectric Power
Irrigation
Water Companies
Businesses
Wells
*Largest use of freshwater in the
United States is Irrigation.
Cleaning used water
 Water
is sent to a water treatment
plant.
 Sticky particles are added to attract the
dirt in the water.
 As the water travels to the next tank,
the particles fall to the bottom of the
tank
 Then the water passes through a series
of filters which are layers of sand,
gravel, and charcoal.
Cleaning water contd.
 Then
the water passes through a
series of filters which are layers of
sand, gravel, and charcoal.
 Lastly
chemicals are added to kill the
harmful bacteria.
 Water
is clean to be released.
video
Conserving Water
 Conserve
home.
water by using less at
 Examples-
fix leaky pipes,turn off
running water when not in use,
Air
 Clean
air is odorless and tasteless
 Ozone-
form of oxygen that protects
humans from the Sun’s harmful rays
Polluting Air
 Air
air
Pollution- harmful particles in the
 Smog-
a yellow haze in the air that is
caused from burning fossil fuels or
trash.
 Smog
irritates eyes and makes it
hard to breathe
Examples of Air Pollution
 Smoke
from factories
 Dust from plowed fields
 Chemicals produced by factories
 Smog
 Volcanic eruptions
Protecting the Air
 The
best way to prevent air pollution
is to keep pollutants from getting
into the air
 There
are laws and rules to prevent
pollution.
 Using
alternative energy helps
prevent pollution