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Crossword clues

Solve these clues to fill the grid.

Partially decomposed organic matter
3 Across
To get rid of by killing
5 Across
An organic compound containing only carbon and ___
7 Across
A colorless toxic gas that occurs in the gases from volcanoes
9 Across
Waste matter that contaminates the water or air or soil (plural)
11 Across
A substance consisting of two or more substances mixed together
12 Across
Matter that has been deposited by some natural process
13 Across
A heavy odorless colorless gas formed during respiration and by the decomposition of organic
14 Across
Living things like trees and flowers that grow in soil
15 Across
A ___ in the stratosphere that contains a concentration of ___ sufficient to block most
1 Down
An odorless very poisonous gas that is a product of incomplete combustion of ___
2 Down
Solid homogeneous inorganic substances occurring in nature having a definite chemical composition
4 Down
The phenomenon of ___ or gravel accumulating
6 Down
Undesirable state of the natural environment being contaminated with harmful substances as
8 Down
Condition in which the earth's surface is worn away by the action of water and wind
10 Down
A caustic substance produced by heating ___
16 Down

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