Global Warming

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Global warming is a increase in the earth’s temperature usually due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants. The greenhouse effect The greenhouse effect is a warming of Earth’s surface caused by the existence of water vapor, carbon dioxide, methane, and certain…

Cement

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Cement is a substance used for construction that sets and hardens to other materials to bind them together. Cement is rarely used on its own, but rather to combine sand and gravel together. Cement mixed with mass produces, or with sand and gravel, produces concrete. Cement Uses Cement can be…