All rock on the ocean floor is less than 180 million years old because?

Because the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.

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.