English: Astronaut photo of ash cloud from Mount Cleveland, Alaska, USA. Русский: Извержение вулкана Кливленд на Аляске 23 мая 2006 года. (Photo credit: Wikipedia)
You have all heard of the Ice Age. Not the movie, the time period. The Ice age was an age of global cold. What caused all this? My belief (which is the same as other creationists) is that when God released the flood with all the volcanoes and such, the water that came up from the ground was very warm from being so close to the mantle, and so the oceans afterward were very warm, and released a lot of steam. This steam covered the earth, and it cooled from being so high, so it was very much snowing.
Also, when the volcanoes went boom, they released a lot of ash into the air, which much of the time blocked out the sun, cooling down the earth.