Energy can be renewable or nonrenewable. Renewable energy sources include solar, wind, hydroelectric and biomass and can be naturally replenished, while nonrenewable sources like fossil fuels are limited and produce air pollution when burned. Nuclear energy is also nonrenewable but produces less air pollution than fossil fuels. Conserving energy helps prolong nonrenewable sources and reduces electric bills.

1. Unit 2 Review

2. Energy
• Energy is the ability to do work!
• Energy canNOT be created or destroyed
• Instead it changes from one form to another
• We get energy from nonrenewable and
renewable energy sources
• Renewable means it can be replaced
• Nonrenewable means it canNOT be easily
replaced.

3. Nonrenewable energy
sources
• Comes from nonrenewable sources like fossil
fuels (coal, natural gas and oil)
• Burning of fossil fuels for energy produces a
lot of air pollution
• Air pollution increases the chance of global
warming
• Air pollution increases the chance of acid rain

4. Nuclear Energy
• A nonrenewable energy source
• It is nonrenewable because it needs an
element like Uranium which is not easily
replaced
• Produces less air pollution than fossil fuels, but
produces heat pollution in lakes
• Nuclear energy occurs when the nucleus of an
Uranium is split through the process of fission

5. Renewable Energy
• Comes from renewable sources like the sun &
wind
• Renewable energy types are:
• Solar (from the sun)
• Wind
• Geothermal (from the heat within the Earth)
• Biomass (from plant material and animal waste)
• Hydroelectric (from the water)

6. Conserving Energy
• We want to conserve energy
• So that we don’t run out of the nonrenewable
sources
• So that it cuts down on our electric bill
• Ways we can conserve:
• Turn off lights when we aren’t in a room
• Turn off appliances and electronics when we aren’t
using them
• Change our light bulbs to the compact fluorescent
bulbs