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Atmospheric Science and Air pollution Word Bank

Across
Height above a given level, especially sea level.
A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
colorless, odorless, flammable gas present in natural gas formed by the decomposition of plant matter.
First in order of development.
The envelope of gases surrounding the earth or another planet.
a colorless, odorless toxic flammable gas formed by incomplete combustion of carbon.
The existence of a wide range of different types of organisms in a given place at a given time.
The action of clearing a wide area of trees.
A nonmetallic element that occurs either free or combined especially in sulfides and sulfates.
A colorless, odorless unreactive gas that forms about 78 percent of the earth's atmosphere
The weather conditions prevailing in an area in general or over a long period.
Down
Second in rank, importance, or value.
The gaseous phase of water.
1/3 comes from natural sources while 2/3 comes from human activities; teratogen and neurotoxin.
Middle layer of the earth's atmosphere.
A fuel, such as firewood, charcoal, chips, sheets, pellets, and sawdust.
Rain, snow, sleet, or hail that falls to the ground.
A large area covered chiefly with trees and undergrowth.
A substance enclosed under pressure and able to be released as a fine spray, typically by means of a propellant gas.
Materials such as coal, gas, or oil that is burned to produce heat or power.