Page 110 - Computer Class 07
P. 110
Adding Border to the Image
Adding a border to your image might help the visitor recognise that the image is a
link. However, the net is filled with image that work as links and have no borders to
see if they are links.
The code is as follows:
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Pollution
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Pollution
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Fossil fuel is a term used to describe a group of energy sources that were formed from
ancient plants and organisms during the Carboniferous Period, approximately 360 to
286 million years ago, prior to the age of dinosaurs.
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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Computer-7 110 Computer-1