Page 108 - Computer Class 07

At that time, the land was covered with swamps, filled with microorganisms, marine

organisms, trees, ferns and other large leafy plants. As the organisms and plants
died, they sank to the bottom of the swamps and oceans and formed layers of a

spongy material called peat. Over millions of years, the peat was covered by sand,

clay and other minerals, which converted the peat into sedimentary rock. Over time,
different types of fossil fuels formed, depending on the combination of organic matter
present, how long it was burried and what temperature and pressure conditions

existed when they were decomposing.

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Some fossil fuels, such as coal, are an abundant and cheap form of energy. Others
like oil, have a variable cost depending on geographic location.</FONT>

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Fossil fuels are non-renewable resources, as they have taken millions of years to form.
Once those resources are used, they will not be replenished. Moreover, fossil fuels are
the largest source of carbon dioxide, a greenhouse gas which contributes to climate

change and their production causes both environmental and human health impacts.

These concerns are triggering the world to look at alternate sources of energy that are
both less harmful and renewable. Additionally, the gradual depletion of conventional

fossil fuel reserves has led companies to develop more challenging reserves. These
unconventional resources usually have higher production costs and a greater risk of

environmental impact.</FONT>

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Now, save the Notepad file.

Computer-7 108