7.2 Review

What percentage of the world's energy comes from renewable sources (2003)?

• 1%
• 7%
• 13%
• 20%

What is fossil fuel?

• A nonrenewable fuel
• A renewable fuel
• A type of solar energy
• A form of wind energy

What happens when fossil fuels are burned?

• Stored energy is released
• They become renewable
• They turn into rocks
• They release beneficial chemicals

Which of the following are considered evidence of the earth being young?

• Radiocarbon in Diamonds
• Tightly folded rock strata
• Earths decaying magnetic field
• Dinosaur soft tissue
• Human population growth

What is coal considered to be in most stages?

• Metamorphic rock
• Igneous rock
• Sedimentary rock
• Volcanic rock

Which step of coal formation includes swap matter decaying and is compacting over time, becoming peat.

• Step 1
• Step 2
• Step 3
• Step 4

Which step of coal formation includes Anthracite forming?

• Step 1
• Step 2
• Step 3
• Step 4

Which step of coal formation includes lignite becoming harder, sedimentary bituminous coal?

• Step 1
• Step 2
• Step 3
• Step 4

What is the composition of Petroleum?

• Hydrogen and oxygen compounds
• Hydrogen and carbon compounds
• Carbon and nitrogen compounds
• Carbon and sulfur compounds

What is the primary role of natural gas in relation to oil deposits?

• It causes wasteful gushers
• It helps bring oil to the surface
• It is mixed with oil to form petroleum
• It hinders drilling operations