“In the six hundredth year of Noah’s life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.”
Genesis 7:11 (KJV)
These “fountains of the deep” would have brought much hot water and lava to the earth’s surface. This in itself would have released much water vapor into the atmosphere – volcanic emissions often have large proportions of water. Also when these ‘fountains’ poured directly into the oceans, it would have raised their average temperature, increasing evaporation. And all the volcanic ash in the air after the Flood would block out much sunlight, cooling the land.” If the snow fell faster than it could melt, then great ice sheets would result. In the years following the flood, many animals like the woolly mammoth were trapped in these huge snowfalls.