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.
Coal tar, a dense nonaqueous phase liquid (NAPL), is a. common subsurface contaminant at sites of former man-. ufactured gas plants. A proposed remediation technology. is water-miscible solvent extraction, which requires un-. derstanding of the effect of water-miscible solvents on the. solubility of coal tar.