Natural Resources

1
Natural Resources

• How are resources used?
• What are the effects of using natural resources?

2
Fossil Fuels

• Fuels formed hundreds of millions of years ago
  from the remains of dead plants and animals
• They are a non-renewable resource
• Types of Fossil Fuels coal, oil and natural gas

3
Natural Resources

• Renewable Resources
• Any resource that can be replaced by nature
• Examples Soil, water, living things

• Non-Renewable
• Any resource that cannot be replaced by nature
• Examples Fossil fuels and minerals

4
Uses of Fossil Fuels

• Coal is used to generate electricity
• Natural gas is used to heat homes
• Oil is used to make gasoline for transportation
• Industry/factories use lots of fossil fuels
• Main source of energy for electricity, homes,
  gasoline and factories.

5
Problems with Fossil Fuels

• In 100 years we will have used up all of our
  fossil fuel reserves
• Pollution is formed when fossil fuels are burned.

6
Alternative Sources Of Energy

• Solar energy, wind energy, and hydro-electric
  energy can be used instead of the fossil fuels.
• Also, geothermal, tidal, biomass, and hydrogen
• Alternative energy sources produce less pollution
  than fossil fuels

7
Solar Energy

• Solar energy used to heat buildings and to
  produce electricity.
• Photovoltaic cell- converts sunlight to
  electricity
• Problems w/ solar energy
• Sun doesnt always shine
• Solar panels are expensive

8
Other Alternative Sources

• Alternative energy sources have their downfalls
• Wind/water/sunlight are not predictable
• It is expensive to convert to a new energy source

9
The Earths Water Supply

• 97 of all water is in the oceans
• 3 freshwater is found in groundwater, lakes, and
  rivers
• Our water supply is being polluted very rapidly

10
Freshwater Supply

• Most of our freshwater comes from ground water
• New sources of fresh water include desalination
  and melting glaciers

11
The Water Cycle

• Precipitation - water vapor falls from atmosphere
  (rain, hail, snow, sleet)
• Evaporation - water is pulled from the surface
  and changes into a gas
• Condensation - water vapor cools and condenses
  into clouds - precipitation
• Run-Off- water moves with gravity - downhill

12
Pollution

• When substances are released into the environment
  that change the environment for the worse
• 3 kinds of pollution
• - air, land, water
• Human activity and factories are the main
  causes of pollution

13
Land Pollution

• Obtaining and using certain energy sources such
  as fossil fuels can pollute the land.
• Wastes from factories can pollute the land
• Nuclear power plants dispose radioactive wastes
• Garbage pollutes the land in landfills

14
Air Pollution

• Automobiles and factories are the biggest sources
  of air pollution
• Smog - thick, brown haze that forms when
  chemicals are in air
• Acid rain - chemicals in air cause rain to be
  more acidic

15
Water Pollution

• Causes of water pollution include
• oils spills, factories dumping waste products
  into rivers and lakes, sewage being dumped and
  agricultural run-off

16
Reducing Pollution

• Everyone should conserve energy when possible
• Scientists need to find cleaner ways to use
  energy
• Everyone needs to make sure that wastes are
  disposed of in the safest possible way
• RECYCLE