Transcript Water, Air, and Land Resources

Warm Up 10/17
Hydroelectric power is produced by ____.
a. tides that pour through a dam barrier
b. electric current that flows across a dam
c. falling water that turns a turbine
d. hot water that comes from deep underground
2) The fuel for nuclear fission in nuclear reactors is ____.
a. hydrogen
c. carbon
b. petroleum
d. uranium
3) How does nuclear fission produce energy?
a. Controlled nuclear chain reaction produces heat, driving
steam turbines to produce energy.
b. Uncontrolled nuclear reaction produces heat, driving
steam turbines to produce energy.
c. Carbon atoms are bombarded by neutrons.
d. Moving water turns turbines to produce electricity.
Answers: 1) c. 2) d. 3) a.
1)
Water, Air, and Land
Resources
Chapter 4, Section 3
The Water Planet







Most of the water on the planet is salt water, not the
fresh water that people need in order to live
Each day, people use fresh water for drinking, cooking,
bathing, and growing food
Point Source Pollution – water pollution that comes
from a known and specific location
Nonpoint Source Pollution – water pollution that does
not have a specific point of origin
Runoff – water that flows over the land surface rather
than seeping into the ground
Pollutants can damage the body’s major organs and
systems, cause birth defects, lead to infectious diseases,
and cause certain types of cancer
Fish and other aquatic life that live in polluted waters
often concentrate poisons in their flesh, making them
dangerous to eat
Water Pollution
Earth’s Blanket of Air
Earth’s atmosphere is a blanket of nitrogen, oxygen, water
vapor, and other gases
 The chemical composition of the atmosphere helps maintain
life on Earth
 Certain greenhouse gases—carbon dioxide, methane, and
water vapor—help maintain a warm temperature near the
surface
 Pollution can change the chemical composition of the
atmosphere and disrupt its natural cycles and functions
 Global Warming – the increase in average temperatures of
Earth and the atmosphere due in part to increased carbon
dioxide levels
 Chlorofluorocarbons (CFCs) once used in air conditioners
and plastic foam production destroy ozone, resulting in an
increased incidence of health problems like cataracts and
skin cancer

Primary Air Pollutants
What They Are
Sulfur
Oxides
16%
Particulates
Volatile
Organics
14%Nitrogen
Oxides
15%
6%
Carbon
Monoxide
49%
Where They Come From
Solid
Industrial Waste
Processes Disposal
3%
15%
Stationary
Source
Fuel
Combusti
on
27%
Misc.
9%
Transporta
tion
46%
Concept Check
 What
is the role of ozone in the
atmosphere?
 Ozone absorbs harmful ultraviolet
radiation from the sun, thus protecting life.
Land Resources





Earth’s land provides soil and forests, as well as
mineral and energy resources
There are an estimated 500,000 mines in the
U.S., they are essential for mineral production,
but tear up Earth’s surface and destroy
vegetation
Farmers are able to produce more food,
because of increased usage of irrigation to dry
areas, but this process can leave behind soil that
has too great of a salt content to grow anything
Clear-cutting, the removal of all trees in an area
of forest, can greatly damage the land, leaving
that area susceptible to soil erosion
Land also serves as a disposal site, such as
landfills and other waste facilities
Strip Mining
Assignment
 Read
Ch. 4, Sect. 3 (pg. 108-112)
 Do Section 4.3 Assessment #1-7 (pg. 112)
 Start studying for the UNIT TEST
(Chapters 1-4) on Tuesday/Wednesday
10/21-22