What technology can make coal a cleaner fuel? fluidized-bed combustion building smoke stacks taller implementing a prewash of coal prior to combustion using lower quality, high sulfur coal mixing coal with natural gas to create a hybrid fuel?

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Is laundry detergent an acid or a base?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this