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Crossword clues

Solve these clues to fill the grid.

Undesirable state of the natural environment being contaminated with harmful substances as
3 Across
Large area covered with trees
5 Across
Food that is discarded
7 Across
To cause to repeat a cycle
8 Across
Layer of air around the Earth
9 Across
An increase in the average temperature of the earth's atmosphere
10 Across
Someone regarded as certain to succeed
12 Across
The natural world around us
13 Across
The offspring at one birth of a multiparous mammal
15 Across
An occurrence of improvement by virtue of preventing loss or injury or other change
1 Down
Permanently inactive
2 Down
Inefficient in use of time and effort and materials
4 Down
Involving risk or danger
6 Down
A living organism characterized by voluntary movement
11 Down
The planet we live on
13 Down
Of or relating to or caused by a ___ or poison
14 Down

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