Earth Science Unit 7 Review

Define ore.

• A rock.
• A natural mineral whose concentration of economically valuable minerals is high enough for the material to be mined profitably.
• A conjunction that is used to signal that a list of options are generally all alternatives to one another.
• A natural mineral whose concentration of economically cheap minerals is low enough for the material to be mined at a loss.

Why are coal, petroleum, and natural called fossil fuels?

• They formed from the remains of organisms that died millions of years ago.
• They are an old-fashioned way of getting energy.
• They are formed from many different hydrocarbons.
• They are made from currently-living organisms who donate material to use as fuel.

What naturally-occurring isotope is typically used for nuclear fission?

• Uranium-235
• Uranium-238
• Iodine-131
• Cesium-137
• Strontium-90

Fossil fuels consist primarily of a class of compounds called

• hydrocarbons.
• nitrocarbons.
• carbohydrates.
• alkenes.
• esthers.

What type of device on calculators is used to generate electricity for it?

• Turbine
• Dam
• Photovoltaic cells
• Engine

How can we use running water to generate electricity?

• Using a turbine, we can convert the kinetic energy of the water to electricity.
• Using a turbine, we can convert the chemical energy of the water to electricity.
• Using a fan, we can convert the kinetic energy of the water to electricity.
• Using a fan, we can convert the thermal energy of the water to electricity.

What do we call plant material, manure, or any other organic matter that is used as an energy source?

• Biofuel
• Fossil fuels
• Organofuels
• Garbage

We call the preservation and wise use of natural resources

• conservation.
• obvious.
• preservation.
• recycling.

What is the job of a catalytic converter in a car?

• To remove various pollutants from a car's exhaust.
• To remove various contaminants from a car's engine oil.
• To convert more of the chemical energy from gasoline to usable mechanical energy.
• To convert more the electrical potential from the battery to usable voltage.

Metals are known to

• have a dull surface.
• provide fuel.
• conduct heat and electricity well.
• occur only in placer deposits.