How Shiva assists in the cosmic annihilation is described in the Puranas. This process of cyclical destruction at the end of each day of Brahma is explained in the Vishnu Purana (Book Six, Chapters Three & Four). It states that at the end of 1,000 cycles of the four yugas the earth is almost exhausted. A great scarcity of food ensues, which lasts 100 years. Because of the lack of food, all beings become weak and slow, and finally perish entirely. Lord Vishnu then assumes the character of Rudra (a form of Lord Shiva), the destroyer, and descends to reunite all of His creatures within Himself. He enters into the seven rays of the sun, causing all moisture in the oceans, rivers, soil, and living bodies to evaporate. The whole earth is dried up. Thus fed with abundant moisture, the seven rays dilate into seven suns, whose radiance glows everywhere and sets the three planetary systems and the lower system of Patala on fire. The three planetary systems become rugged and deformed throughout their mountains, rivers, and seas as they are consumed by these suns. The earth alone remains, destitute of moisture, resembling the back of a turtle.
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