Valence electrons are the electrons in the outmost shell that play a large role in

Valence electrons play a large role in atom bonding. 
 
here this may help,
http://slideplayer.com/slide/5751261/ 

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.

Ithink its c hope it : )