Unit 2 Review

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.

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

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

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)

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