Renewable Energy Power the World?

Which of these converts light from the sun into thermal energy and distributes the heat using pumps and fans?

• a solar plant
• a passive solar system
• an active solar system
• a solar cell

Wind energy is actually an indirect form of

• solar energy.
• magnetic energy.
• nuclear energy.
• electricity.

What is the most widely used source of renewable energy in the world today?

• hydroelectric power
• biomass fuels
• tidal power
• solar power

Which of these is an example of a biomass fuel?

• coal
• oil
• natural gas
• wood

The intense heat from Earth’s interior that warms the magma beneath Earth’s surface is called

• solar energy.
• tidal energy.
• geothermal energy.
• hydrogen power.

A layer of material that helps block the transfer of heat between the air inside and outside a building is called

• solar cell.
• insulation.
• an active solar system.
• a heat exchanger.

Wind and hydroelectric power are both indirect forms of 

• nonrenewable energy.
• solar energy.
• biomass fuel.
• nuclear energy.

Which energy source shown is considered to be renewable?

• Petroleum
• Coal
• Nuclear
• Hydroelectric