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. Natural Gas: Used for heating homes and running appliances such as water heaters and stoves. It contains methane (also known as swamp gas or marsh gas), which is a hydrocarbon. Methane occurs naturally in the earth's crust and is also formed by decaying organic matter such as manure or sewage.