A _______________ is an energy source that cannot be produced, grown, or restored as fast as it is used.

To __________ means to save.

______________ are energy resources made from carbon-rich plant and animal remains.

Which of the following is considered an alternative energy resource?

Which type of power plant uses one of Earth’s nonrenewable resources to produce electrical energy? (It uses uranium)

Which of the following is not an alternative source of energy?

What is Earth's main energy source?

Earth's internal heat, also known as ____________ is another energy source.

____________ is a sedimentary rock formed from the remains of dead plants at the bottom of ancient swamps.

Methane (CH₄) is the main component of __________.

______ means "rock oil".

An example of a renewable energy resource is ____________.

An example of a nonrenewable energy resource is __________

Fossil fuels include petroleum, coal, and _________.

Sources of _________ include wind, solar, hydroelectric, biomass, and geothermal.

______ is extracted from heat stored within the Earth.

_______ includes living or recently dead organic material that can be used as fuel.

Renewable energy from the sun is ___________.

Splitting the nuclei of a kilogram of uranium atoms releases thousands of times more energy than burning the same mass of coal. This is _____________.