1. Renewable and Nonrenewable Resources

2. What is fuel? A fuel is a substance that provides a form of energy
Energy can be in the form of heat, light, electricity, or motion.
When fuel is burned it releases energy: this is called combustion.

3. Fossil fuels What is a fossil? What is a fuel?
Fossil fuels are the energy-rich substances formed from the remains of once living organisms.
Three fossil fuels
Coal
Oil (petroleum)
Natural Gas

4. Nonrenewable resources
Fossil fuels are non-renewable – they are being used up faster than they are made.
Fossil fuels often cause political problems in the world because they are unevenly distributed
Quick!
What are the three fossil fuels?
Coal
Oil
Natural Gas

5. Alternative Energy Resources
We need to find alternative energy resources so that we do not use up all of our nonrenewable resources

6. Renewable Resources A renewable resource is constantly being supplied.
What are some renewable resources?

7. Solar Energy Solar energy – light and heat energy from the sun
Solar energy is the source of most other renewable energy resources
How?
Wind – unequal heating of the Earth causes global winds
Water – sun heats water for evaporation to start the water cycle

8. Wind
Windmills generate large amounts of electric power

9. Flowing Water
Hydroelectric power is electricity produced by flowing water
Water flows through
tunnels and turns
turbines connected
to a generator.
Most widely used
alternative energy
source
Tidal energy - The
tide moves a huge
amount of water
twice each day

10. Biomass fuels
Biomass fuels are fuels made from things that were once alive
Wood
Leaves
Food wastes
Manure

11. Geothermal Energy Magma heats up water underground
The hot water and steam are valuable sources of geothermal energy

12. Sometimes we can have a resource that is non-renewable, but is still an alternative energy resource.
That means it causes less pollution, but once we use it all it is gone!

13. Nuclear Energy
In a nuclear power plant, heat is released from reactions, and turns water to steam
The steam turns a turbine to generate electricity