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Earth Science CH 7 (3&4)

1
2
3
4
5
6
7
Across
1
Produced by heat in earth
3
From the sun in the form of radiation
6
Organic matter that is used as an energy source
7
Produced by the flow of water
Down
2
Can be replaced at the same rate consumed
4
Wise use of natural resources
5
Recovering material from waste for reuse