What characteristic do all renewable resources share?

• Produced by waste products
• Form underground from dead organisms.
  
• Replaced in a short period of time
• Allow energy to pass through them easily

Which of the following is a fossil fuel?

• Wind
• Coal
• Solar
• Biomass

Petroleum and natural gas form from...

• strong winds
• cooled magma
• radioactive materials
• remains of plants and animals 

Hydroelectric power produces electricity using.....

• Wind
• Sunlight
• Moving water
• Dung

 Energy from the sun is known as......... 

• hydroelectric energy
• geothermal energy
• solar energy
• wind energy

Which of the following is a nonrenewable resource?

• milk
• coal
• biomass
• water

Water is renewable because it.......

• can be frozen
• important to all life
• can be replaced constantly
• can evaporate

Fossil fuels are classified as nonrenewable because they.......

• require expensive equipment
• take millions of years to replace
• can be found all over 
• provide all the energy we use

What type of fossil fuel is mined from the ground?

• wind
• coal
• biomass
• air

Which of the following energy sources is the most sustainable?

• Coal

• Solar

• Oil

• Natural Gas