-Ice Age: Collision Course in cinemas this Friday-Subscribe for more: up to date with the latest news. Ice sheets and glaciers melt during warmer phases, which are called interglacials, and expand during colder phases. When their world is threatened, Manny and friends go on a quest to survive the Scrat-tastrophe!In an ice age, temperatures will fluctuate between colder and warmer levels. A mass of glacial ice covering less area than an ice sheet is. As ice sheets extend to the coast and over the ocean, they become ice shelves. Ice sheets contain about 99% of the fresh water on Earth, and are sometimes called continental glaciers. An ice sheet is a mass of glacial ice more than 50,000 square kilometers (19,000 square miles). These dramatic “Snowball Earth” events occurred in quick succession, somewhere around 700 million years ago, and evidence suggests that the consecutive global ice ages set the stage for the subsequent explosion of complex, multicellular life on Earth.
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