Folowing the lalitude of the Earth we observe that the sun’s rays are more intense at the equator and they become less intense as we aproach the poles. At the same time this intensity fluctuates during the seasons due to the Earth's tilted axis (23.5 degree angle), this makes that the hemisphere that is closer to the sun receives more sunlight than the opposing hemisphere.
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As the radioactive materials experience degradation, as underneath the surface in the earth's surface, enormous amounts of heat are generated to send their daughters products.
