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There have been about 11 different ice ages that have occurred in the last 4.6 billion years on Earth. 11,000 years ago an ice age that scientist named "the great ice age" occurred. Over a third of the earth was covered in ice during the great ice age. During an ice age the North and South pole begins to expand and giant ice fields and glaciers grow.
A glacier is a large body of ice moving down a slope or Valley slowly. Sometimes glaciers spread outward on a land surface. Glaciers are moving mass or a river of ice formed by the accumulation of snow compacted over time on mountains or near the North or South Pole. 99% of glacier ice is contained within vast ice sheets known as continental glaciers in the polar regions. Glacier ice is the largest reservoir of fresh water on Earth.
The environment is the circumstances and conditions that surround us. It involves the complex physical, chemical and biological factors like climate, soil and living things that act upon an organism or an ecological community that ultimately determine its form and its survival. In short the environment is the surroundings or conditions in which a person or animal lives and operates.