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MAJOR ENVIRONMENTAL PROBLEMS II

Across
Large-scale _________ have occurred throughout earth's history
The term_______ refers to the number and variety of species that live in an area.
_____________ pollutants do not break down easily, they can build up to dangerous levels in the environment.
A _________ that has become extinct can be considered an example of a nonrenewable natural resource.
Resources are said to have become _______ when a large fraction of the resource has been used up.
One example of a modern-day extinction is the_______Tiger.
Car exhaust and smoke from industry are examples of ___________.
Down
There are three main categories of __________ problems: resource depletion, pollution, or loss of biodiversity.
Resources such as fossil fuels and copper, aluminum and Iron.
Natural resources that can be replaced quickly are __________.