Unit 6 quiz PRACTICE

Which statement best explains an environmental consequence of using nuclear power for electricity?

• It produces ash that improves soil quality near plants

• It creates long-lasting radioactive waste requiring safe storage

• It releases thick smoke that causes acid precipitation

• It consumes more oxygen than coal during combustion

Answer explanation

The correct choice highlights that nuclear power generates long-lasting radioactive waste, which poses significant environmental challenges due to the need for safe storage and management over extended periods.

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Why is nuclear energy classified as a nonrenewable resource?

• Electricity demand is growing every decade

• Uranium ore supplies are limited on Earth

• The fission process is difficult to control

• Power plants are expensive to build and maintain

Answer explanation

Nuclear energy is classified as a nonrenewable resource because uranium ore supplies are limited on Earth. Once depleted, it cannot be replenished in a human timescale, unlike renewable resources such as solar or wind energy.

Two communities are choosing an energy source. One option uses uranium fuel, and the other uses timber from sustainably replanted forests. Which choice helps avoid resource depletion over many decades?

• The timber-powered option because trees can be regrown

• The uranium-powered option because uranium forms quickly

• The uranium-powered option because reactors are very efficient

• The timber-powered option because wood releases no emissions

Answer explanation

The timber-powered option helps avoid resource depletion because trees can be replanted and sustainably managed, ensuring a continuous supply of wood over many decades, unlike uranium, which is finite.

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Look at the bar graph comparing production and consumption for timber, coal, natural gas, and petroleum. Which resource is renewable?

• Natural gas is renewable in this graph context

• Coal is renewable in this graph context

• Timber is renewable in this graph context

• Petroleum is renewable in this graph context

Answer explanation

Timber is considered a renewable resource because it can be replanted and regrown, unlike fossil fuels such as coal, natural gas, and petroleum, which are finite and take millions of years to form.

Using the same bar graph, which resource is most likely to be depleted first if consumption continues to exceed production the most?

• Natural gas shows the largest consumption gap

• Petroleum shows the largest consumption gap

• Timber shows the largest consumption gap

• Coal shows the largest consumption gap

Answer explanation

Coal shows the largest consumption gap, indicating that its consumption exceeds production by the highest margin. Therefore, it is the resource most likely to be depleted first if this trend continues.

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Study the map and notes about ocean wave and wind energy. What is one advantage of ocean wave energy over wind energy?

• Wave energy is more predictable and consistent

• Wave energy is caused by solar heating directly

• Wave energy facilities never affect ecosystems anywhere

• Wave energy operates nonstop without any variation

Answer explanation

Wave energy is more predictable and consistent than wind energy, as ocean waves are influenced by tides and currents, leading to a steadier energy output compared to the variable nature of wind.

Both wave and wind energy are renewable. What else do they have in common?

• Both can generate energy off-shore and avoid environmental issues on land

• Both are caused by solar energy being absorbed by the oceans

• Both work 24-7 so there is no stop in generating electrical energy

• Facilities of both pose no threat to ecosystems or the environment where they are installed

Answer explanation

Both wave and wind energy can be harnessed off-shore, which helps to minimize environmental issues that might arise from land-based installations, making this the correct choice.

Which statement best defines a sustainable energy system?

• Works only when demand is very low

• Generates power with zero environmental impacts

• Uses energy only from fossil fuel sources

• Provides energy without depleting future supplies

Answer explanation

A sustainable energy system provides energy without depleting future supplies, ensuring that resources remain available for future generations. The other options do not align with this principle.

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Classify the resource: wind energy is best described as which type of resource?

• Nonrenewable resource that replenishes fast

• Renewable resource that quickly runs out

• Nonrenewable resource used once

• Renewable resource used repeatedly

Answer explanation

Wind energy is classified as a renewable resource because it is naturally replenished and can be harnessed repeatedly without depleting its source, making it sustainable for long-term use.

A community is choosing an energy source. They want to meet today’s needs while keeping resources available for their grandchildren. Which choice least fits that goal?

• Developing concentrated solar power plants

• Expanding geothermal power generation

• Building more offshore wind turbines

• Relying on the thorium fuel cycle for power

Answer explanation

Relying on the thorium fuel cycle for power is less sustainable as it involves mining and processing, which can deplete resources. In contrast, solar, geothermal, and wind are renewable and better align with long-term resource availability.

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