Which statement best describes the whether shown by the purple combination of semicircles and triangles on a line on a weather map

It seems that you have missed to attach the given map and options for us to answer this question, so I had to look for it. Anyway, here is the answer. The statement that best describes the whether shown by the purple combination of semicircles and triangles on a line on a weather map is a cold front can cause heavy rain, thunder, and lightning. Hope this helps.

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.