Changes

[[Coal mining]] is the extraction of coal for use as a [[fuel]]. It became important after 1800 as coal fueled railroads of the [[Industrial Revolution]], and (where cheap water power was not available), the factories. Coal is now the chief method of generating [[electricity]], along with burning natural gas, using water power in dams, and using nuclear energy.

[[Coal mining]] is the extraction of coal for use as a [[fuel]]. It became important after 1800 as coal fueled railroads of the [[Industrial Revolution]], and (where cheap water power was not available), the factories. Coal is now the chief method of generating [[electricity]], along with burning natural gas, using water power in dams, and using nuclear energy.

Laboratory experiments show that coal can be formed in a matter of months, and with temperatures in the range of 100 to 150 degrees Celsius (210-300 degrees Fahrenheit) for brown coal and 400 degrees Celsius (750 degrees Fahrenheit) for black coal.<ref>Quoted by Walker, 2001</ref>

Laboratory experiments show that coal can be formed in a matter of months, and with temperatures in the range of 100 to 150 degrees Celsius (210-300 degrees Fahrenheit) for brown coal and 400 degrees Celsius (750 degrees Fahrenheit) for black coal.<ref>Quoted by Walker, 2001</ref> This is yet to have been replicated by mainstream science

== Types of coal ==

== Types of coal ==