Which of the following terms refers to areas of gas on the on the suns surface that are cooler than the gases around them

The answer is Sunspots, these certain spots are black and dark, and are much cooler than the surrounding surface.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Neither model is able to show the reactivity of potassium.