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ES Chpt 25

Abdulfattah_Mozeb

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Across
3.occurs when air contains harmful levels of pollutants; can be caused by natural phenomena, such as forest fires or volcanic eruptions, or by human activities, such as burning fossil fuels
4.material left after ore is extracted that may release harmful chemicals into surface water or groundwater
6.naturally accumulating mixture of sand, gravel, and crushed stone found in floodplains, alluvial fans, or glacial deposits
8.resources provided by Earth, including air, water, land, all living organisms, nutrients, rocks, and minerals
9.natural resource that may be associated with igneous rocks or formed by processes at Earth's surface
Down
1.resource that exists in Earth's crust in a fixed amount and can be replaced only by geological, physical, or chemical processes that take hundreds of millions of years
2.unweathered, solid parent rock that may consist of limestone, marble, granite, or other quarried rock
5.process by which productive land becomes desert; in arid areas can occur through the loss of topsoil
7.process that removes salt from ocean water in order to provide freshwater

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