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Environmental Science puzzle 1

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Across
2.the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow (2 Words)
4.the lowest region of the atmosphere, extending from the earth's surface
6.the branch of biology that deals with the relations of organisms to one another and their surroundings
7.the transfer of heat by air currents
9.the impact of a person or community on the environment (2 Words)
10.the regions of the surface, atmosphere, and hydrosphere of the earth
13.the layer of the earth's atmosphere above the troposphere
14.transfer of energy across space and in the atmosphere
15.materials and substances such as mineral (2 Words)
17.absorbs the UV radiation from getting to the earth
18.the presence in or introduction into the environment of a substance or thing that has harmful or poisonous
19.the variety of life in the world in particular habitats or ecosystems
20.of or found in fresh water; not of the sea (2 Words)
Down
1.the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise,
3.relating to the natural world and the impact of human activity on its condition (2 Words)
5.the science of practice of farming including cultivation of soil and growth of crops
8.gases that are trap heat near the earth (2 Words)
11.able to be maintained at a certain rate or level:
12.turn from liquid into vapor
16.keeps the earths temperatures at which living things can survive

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