Mastering 6

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Many pollutants from coal-fired power plants are properly managed today. Which of the following is currently considered to be the biggest threat to the environment?

Carbon dioxide

Inner core

Composed mostly of solid metal

Outer Core

Composed of molten metal

The earthquakes that occur in Southern California generally occur above a

Fault

Old Faithful Geyser at Yellowstone National Park in the United States acquires its energy from a

Hot spot

found in the Atlantic Ocean between North America and Europe is composed of dense and relatively young rock.

Seafloor crust

Layered _______________________ exposed by erosion can be seen when looking at the Grand Canyon in the United States.

Sedimentary Rock

All fossil fuels, including coal, are considered an indirect form of ____________ energy.

Solar

The extremely deep ocean Marianas Trench is a result of

Subduction

What color smoke coming from a coal-fired power plant would indicate wasted fuel?

black

Upper Mantle

contains the asthenosphere just below the crust

Australia is composed of relatively old and thick

continental crust

Where is electricity made at a coal-fired power plant?

generator

During peak usage, what happens to the cost of electricity?

it almost always increases

The slowly increasing distance between South America and Africa is due to

seafloor spreading

Lower Mantle

thick layer of dense rock surrounding the core.

Crust

thin rock layer at Earth's surface


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