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During the day, earth gets heated up due to incoming solar rays, which is called insolation. At night, this heat is reflected back into space from Earth's surfaces. This phenomenon of reflection of daytime heat into space is called terrestrial radiation. It works best if it is non-cloudy, as clouds block these heat radiations. 
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Long-wave electromagnetic radiation originating from Earth and its atmosphere. It is the radiation emitted by naturally radioactive materials on Earth including uranium, thorium, and radon
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