What is the change in elevation from point a to point C the map above

It is 300 if each layer =100 then u count how many layers there are in between and there are tree so 300???

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.