1. Section 4.3-Natural Resources
Get out a piece of paper for 4.3 notes and write the Big Idea below.
Section 4.3-Natural Resources
Big Idea: Natural resources we use on a daily basis and can either be renewed or not.

2. Soil and Forests
Resource-any physical material that makes up part of the Earth and that people need /value.
Renewable/Nonrenewable

3. Soil Horizon
Why do dry areas with less rain have more minerals in the soil that places with more rain?
Leaching (caused by rainwater) is the downward movement of minerals and humus in soils
Soil is a natural material that includes rocky and organic mater (sediment and animals/plant remains) that is why it is a renewable resource.
Soil is different from place to place because of the animals and minerals in different areas. Compare here to Oklahoma.
Answer to question- limited leaching so minerals can build up.

4. Why do dry areas with less rain have more minerals in the soil that places with more rain?
Sustaining Soil Resources
Contour Plowing -plowing land across field to reduce slope and thus erosion
Crop rotation- changing the crops planted in and area
Irrigation works in arid places but can = soil salinization…salt from the water built up over time

5. What steps have been taken to replenish and prevent deforestation?
Forests
Reduce erosion, provided habitats and resources
Deforestation-destruction or loss of forests
Reforestation-replanting of trees
Answer to question- reforestation

6. What are major causes of air pollution?
Chemicals in air mix with sunlight to create smog…Los Angeles and Mexico City
Acid Rain – chemical combine with water vapor-ruins lakes, trees and buildings
Air pollution can hurt the ozone layer
Water
Controlled by dams, canals, reservoirs and aqueducts
Accessed –wells- tapping into aquifers (layers of rock were water is plentiful)
Fossil water is desert water that is underground from thousands of years ago
Video of aqueducts 1:55 min
California aqueduct 10 min

10. Minerals are solid substances that come out of the ground
Mineral Resources
Minerals are solid substances that come out of the ground
Usage
Used to build, make metals, glass…
Mines
Ore is removed and substance is removed from rock at alternate location
Some minerals are plentiful…others are rare
Examples of mineral resources are metals, rocks, salt
Can be used for jewelry, building,alumninum,

11. Fossil fuels-nonrenewable-coal, natural gas, petroleum
Energy Resources
Fossil fuels-nonrenewable-coal, natural gas, petroleum
from remains of ancient plants and animals over millions of years
Coal is old but effective and plentiful
Coal pollutes
coal makes dyes
Petroleum (oil) accessed by drilling-make gasoline, diesel and heating fuel, asphalt, other fuels, explosives, food additives, medicines, pesticides and plastics
but given artificial smell for detection-heat homes
Uranium-nuclear plants don’t pollute air but produce radioactive waste
some of our most important resources are sources of energy which are usually nonrenewable.
Coal use to be used in stl but sometimes the pollutions was so bad it made it look almost night outside.
Show picture Beijing china from coal

12. Alternative Energy Resources
Hydroelectric Power-electricity produced by moving water
Dams hold water back, then allow it to run through small openings =power …10% of U.S. energy
Windmills…wind turbines
Geothermal Energy-heat of the Earth’s interior, plants built in places near volcanoes and hot springs
Solar Energy-energy of the sun