What should you NOT do when trying to put out a grease fire?
A. cover the flames
B. add cold water
C. add baking soda
D. use an "ABC" fire extinguisher

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