Wind eroding rocks. is it a chemical or physical change ?

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

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

When a scientific theory has been tested and proved by the scientific community, it becomes a law