exists and is an alternate of . Technically the longest war ever was the 335 years long, there was no casualties in it or anything but it was officially declared March 30, 1651 and officially ended on April 17, 1986.
Interesting Facts about Ice Ages. 1  The current interglacial period that the Earth is in is called the Holocene period. 2  Most of Canada was covered with ice just 20,000 years ago. 3  An ice age can occur if the global temperature drops just a few degrees for a long period of time.
How does the ice build up? Throughout the Quaternary period, high latitude winters have been cold enough to allow snow to accumulate. It is when the summers are cold, (i.e., summers that occur when the sun is at its farthest point in Earth's orbit), that the snows of previous winters do not melt completely. When this process continues for centuries, ice sheets begin to form. Finally, the shape of Earth's orbit also changes. At one extreme, the orbit is more circular, so that each season receives about the same amount of insolation.