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Unit 4 Vocabulary

Across
Small particles of dust released into the atmosphere by many natural processes and human activities
suitable for drinking
A nonrenewable resource such as coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.
Materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain
rain that contains a high concentration of acids
a resource that takes so long to form that it can't be easily replaced.
The process of saving or protecting a natural resource
Sewage and fertilizer runoff adds nutrients to lakes; phytoplankton decreases and cyanobacteria increases.
Down
Any natural resource that can replenish itself in a relatively short period of time, usually about the length of time it takes to consume it.
a natural resource that humans use to generate energy
Anticipated increase in Earth's temperature, caused by carbon dioxide (emitted by burning fossil fuels) trapping some of the radiation emitted by the surface.
Concentration of trace substances such as carbon monoxide, sulfur oxide, hydrocarbons, and solid particulates, at a greater level than occurs in average air.
deterioration of land quality (topsoil, organisms, vegetation, water quality), usually caused by its exploitation
Natural resources that are used to make objects, food, or drink
An increase in the percentage and in the number of people living in cities.
A lake that stores water for human use.
Looking after something so it can be passed on to the next generation
air pollution by a mixture of smoke and fog