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Unit 7 vocabulary 1

Across
The resources that earth provides
Resources that you can not replace when they run out such as coal ,oil and natural oil.
Resources that never run out
A mixture of gravel ,sand,and crushed stone that mixes near earths surface
Pollutants in air become harmful to human health
The material left after the ore is extracted
Down
Occurs when salt water is distilled
Substances that can affect your health
The replacement of renewable resources at the same rate they are consumed
The process where productive land becomes desert
Solid rock underneath the parent rock
A natural resource that can be mined at a profit ,ex : gold