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Earth's Systems-Part 3

Across
A resource which can be used repeatedly and replaced naturally. Examples include oxygen, fresh water, solar energy, wood, and biomass.
Deposits of minerals that are large enough to be mined for a profit such as iron and other metals.
Resources that are used faster than they can be replaced by natural process. Most fossil fuels, such as oil, natural gas and coal are considered nonrenewable resources.
Materials, formed from decayed plants and animals that have been converted to oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years.
Down
Materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain.
An uneven system or situation that is unfairly arranged or organized.
The extraction (taking out) of valuable minerals or other geological materials, such as metals, ores, coal, etc., from the earth.