High School Earth, Space, and Geophysical Curriculum Essentials May 2009 9. Boulder Valley School District High School Earth, Space, and Geophysical. Science Curriculum Essentials Document. Enduring Understandings. are the big ideas central to a content area that have lasting value beyond the classroom and.
See also: Coal gasification and Coal seam gas. Coal gas is a flammable gaseous fuel made from coal and supplied to the user via a piped distribution system. Town gas is a more general term referring to manufactured gaseous fuels produced for sale to consumers and municipalities.
Natural gas is found in coal seams hundreds of metres beneath the earth's surface. Just like conventional natural gas, coal seam gas (CSG) is comprised mostly of methane (CH 4) and is a type of petroleum that was formed from the compressed remains of plants over millions of years.