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Monday, 11 May 2015
Planet Earth - Coal
Coal seams are found in many places around the world.
Coal was formed hundreds of millions of years ago.
Geologists say that a three-metre (10-foot) coal seam took between
12,000 and 60,000 years
Ancient trees and other plants lived, died and were fossilised.
The formation of a coal seam of one metre thickness required approximately 100 metres of plant material.
All those plants took
out of the atmosphere.
Some larger coal seams are, for example, 10 metres thick.
They took around
to form, but have been mined and burned in a little over
35 billion tonnes
of CO2 are produced each year by human activities, including burning coal.
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