Extreme natural hazards and population growth
The main reason why Earth is warmer at the equator than at the North and South Poles are thats where the sunlight shines at a lot of times. The sunlight never really shines directly at the North and South Poles like it does with the equator.
Gamma rays, x-rays, ultraviolet, infrared, microwaves, radio waves
Basalt is the rock that makes up a majority of the oceans floor!
Geographic location is the best answer
