Global warming is an international concern. It is the result of such things as overpopulation, deforestation, and ozone depletion. Solutions are often suggested on a large scale: raising fossil fuel prices and taxing the emissions of large companies. On the individual level, we as world citizens can do our part to help reduce global warming BEST by

• growing our own food.

• reducing our fossil fuel use.

• becoming environmental activists.

• Using only organic products in the home

Earth has many different types of natural resources. The resources that can take centuries to millions of years to replenish are referred to as

• consumable

• nonrenewable

• potential

• renewable

Many scientists are convinced that the growing human population is contributing to the gradual warming trend that is occurring on planet Earth. According to the researchers, which human activity is MOST likely to be a contributing factor in global warming?

• Humans have added carbon dioxide to the atmosphere by burning fossil fuels.

• Humans have released vast quantities of chemicals that have created excess ozone in the upper atmosphere.

• Humans have changed the chemistry of the world's oceans by the use of phosphates and nitrogen-containing compounds.

• Humans have created acid rain by releasing sulfuric acids into the air in the exhaust from factories and power plants.

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Based on this map, most coal in the United States is found in the

• South and West

• Southeast and Northwest

• West and center of the country

• Northeast and center of the country

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Why is recycling aluminum cans beneficial?

• The quality of the aluminum can improves each time it is recycled.

• Aluminum is rarely used and it makes no sense to produce new cans.

• Aluminum is a very available mineral and commonly used for making cans.

• Recycling reduces the need to mine more aluminum and helps conserve this mineral.

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Petroleum fuels are considered nonrenewable resources because they are formed from __________ compressed between layers of rock.

• Wind

• Water

• Living organisms

• Radioactive compounds

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Which is a nonrenewable source of energy?

• wind

• hydropower

• natural gas

• solar energy

The largest copper mine in the United States is located in Arizona. Why is copper considered to be a non-renewable resource?

• Copper cannot be recycled.

• Copper ore is not replaced once it is mined.

• Copper is present in all rocks and ores on Earth.

• Many substitutes can be used for copper in industry.

Fuel made from plants are called biofuel. These fuels can be renewed in anywhere from 2 to 100 years depending on the plants used to create the fuel. Compared to fossil fuels, biofuels

• take a much longer time to be renewed.

• take a much shorter time to be renewed.

• take a similar amount of time to be renewed.

• are both considered nonrenewable sources of energy.

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Oil, natural gas, and coal are considered to be nonrenewable resources. Why are these fuels considered to be nonrenewable?

• The burning of these fuels does not allow the waste products to be recycled.

• These fuels are available in a limited supply. When the fuel is used it is no longer available.

• The amount of pollution released from the use of these fuels is much higher than with renewable sources.

• The technology used to generate energy by the use of these fuels is much older and less efficient than current technology.

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