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CH. 23-Natural Resources

Across
Burning of fossil fuels mixes with sunlight
To happen again
Resource that is needed for survival by living things
Mixture of gases that forms a layer around the earth
Earth's temperature is increasing
Resource that will not run out
Substitute form
Substance that is found in rocks and underground
Making new products out of old products
Any carbon-containing derived from dead plant and animal matter
Top layer of soil
Gases from automobiles and factories mix with the atmosphere and produce rain or snow
Water that moves over land
Down
Fuel made from animal fats and vegetable oils
Something that has two different components performing the same task
Resource that is being used up as faster than it can be replaced
Thermal energy within the Earth
Contamination of the environment with harmful substances
Act of meeting human needs in ways that ensure future generations will also be able to meet their needs
Resource that is being replenished by natural processes
Prevents harmful sun rays from reaching the Earth
Keeping or saving something from change or being damage
Pieces of trash that has been left by people
Environmental protection agency-watches over human activities