Renewable Energy Resources

passive

_____ solar energy used design elements that capture energy in sunlight.

wind farm

A group of wind turbines that produce electricity is called an _____ .

vegetable

Biodiesel is made from _____ oil and fats.

tidal

Coastal areas that have great differences between high and low tides can be a source of _____ power.

biomass

Energy produced by burning organic matter such as wood, food scraps, and alcohol is called _____ energy.

gasoline

Ethanol and _____ are two vehicle fuels that can be made from biomass.

sugars

Ethanol is made from _____ in plants such as corn.

magma

Geothermal energy from hot rocks or _____ heats water that makes steam, which turns turbines connected to generators that produce electricity.

pollution

Renewable energy resources produce less _____ than fossil fuels.

natural

Renewable resources come from _____ processes that have been happening for billions of years and will continue to happen.

electrical, generators

Solar cells in watches and calculators capture light energy and transform it to _____ energy, while solar power plants generate electricity by transforming energy in large areas to turn turbines connected to _____ .

Sun

Solar energy is energy from the _____.

renewable

Some states require power companies to produce a percentage of electricity using _____ resources, and U.S. government has programs to encourage use of renewable resources.

active

Technology, such as solar panels, that gathers and stores solar energy that heats water and homes is called _____ solar energy.

costly

Two disadvantages associated with using renewable resources are that some are _____ or limited to certain areas.

renewable

The main advantage of using _____ energy resources is that they will be available for millions of years to come.

wood

The most widely used biomass is _____ .

biomass

The renewable energy resource used most in the United States is _____ energy.

geothermal

Thermal energy from Earth's interior is called _____ energy.

turbines

Tidal power uses water that flows across _____ as the tide comes in during high tides and as it goes out during low tides.

dam

To produce hydroelectric power, humans build a _____ across a powerful river.

renewable

You can encourage the use of _____ energy resources by educating others and buying products made using these resources.

geothermal

_____ energy can be used to heat homes and generate electricity in power plants.

renewable

_____ energy currently meets only 7 percent of U.S. energy needs.

wind

_____ energy is a renewable resource that has been used since ancient times to sail boats and to turn windmills.

hydroelectric

_____ power is electricity produced by flowing water.