High School Earth, Space, and Geophysical Curriculum Essentials May 2009 10. Boulder Valley School District High School Earth, Space, and Geophysical. Science Curriculum Essentials Document. If learning is to endure in a flexible, adaptable way for future use, then teachers must design units.
A curmudgeon with years of practice. Coal ash is the residue from burning coal and contains all of the nonvolatile components of he coal (carbon compounds, sulfur and some metals). The ash is made up of silicates, metals (including toxic metals like mercury and uranium) and some unburnt carbon.
tar. see tar and pitch tar and pitch,viscous, dark-brown to black substances obtained by the destructive distillation of coal, wood, petroleum, peat, and certain other organic materials.The heating or partial burning of wood to make charcoal yields tar as a byproduct and is an ancient method for the.....he low-temperature (500Â°-600Â°C) dry distillation of coal or peatâthat is, semicokingâyields so-called primary tar. The coking of coal yields coal tar. The tar formed by heat treating wood is called wood tar.