Most of the energy we use come from

• the sun

• the air

• the oceans

• the soil

Electrical energy can be produced from

• chemical energy

• radiant energy

• mechanical energy

• all of the above

Which uses the most energy in homes each year?

• lighting

• water heating

• heating and cooling rooms

• refrigeration

People consume lots of energy. Which fuel provides the most energy?

• petroleum

• coal

• solar

• natural gas

Coal, petroleum, natural gas, and propane are fossil fuels. They are called fossil fuels because:

• they are burned to release energy and they cause air pollution

• they are mixed with fossils to provide energy

• they are nonrenewable and will run out

• they were formed from the buried remains of plants and tiny animals that lived hundred of millions of years ago

Gasoline is produced by refining which fossil fuel?

• natural gas

• coal

• petroleum

• propane

Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas? 

• it’s safer

• it’s portable

• it’s cleaner

• it's cheaper

What sector of the economy consumes most of the nation’s petroleum?

• residential

• commercial

• industrial

• transportation

Global warming focuses on an increase in the level of which gas in the atmosphere?

• ozone

• sulfur dioxide

• carbon dioxide

• nitrous oxide

Solar, biomass, geothermal, wind, and hydropower energy are all renewable sources of energy. They are called renewable because they

• are clean and free to use

• can be converted directly into heat and electricity

• can be replenished by nature in a short period of time

• do not produce air pollution