Coal is a black mineral fuel
that consists mainly of the element carbon. In addition to
carbon, coal contains a variety of hydrocarbons, often traces of
sulfur, and moisture. Coal occurs as seams (layers in the
rock strata) within the Earth's crust. The depth at which
coal seams are found varies enormously. In some coalfields
the seam can lie just below the surface. Usually, coal seams
are buried beneath hundreds of meters of rock.
The properties (qualities or
power) of coal have been known for at least 2,000 years.
However coal was used very little until the Industrial Revolution
of the 1700s. Before this time, firewood and charcoal
provided the entire world's energy needs. During the 1700s, coal
quickly replaced charcoal as an industrial (connected with
industry) fuel. In the 1800s, coal provided the driving
energy behind the great Age of Steam. Today, coal is used
mainly in the production of electricity.
Answer the questions below.
Coal consists mainly of the element .
Coal is found within the Earth's .
Before the 1700s, firewood and
provided energy for the world's energy needs.
Coal seams are usually found beneath hundreds of
During the 1700s,
replaced charcoal as an industrial fuel.
The properties of coal have been known for over
Today coal is used mainly in the production of .
Coal occurs in seams which are
sulfur, and moisture.
layers in the
Coal provided the driving
energy behind the great Age of Steam in the
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