The Cenozoic 65 million years ago to present is broken down into 4 periods called the Quarternary period. One of these area is known as The Pleistocene Epoch, 1.8 million years ago to 10,000 years ago. Pleistocene means "Great Ice Age" An ice age occurrs when more snow falls then melts in one season. Over many seasons the snow piles up turns to ice and creates it own climatical changes. Today we are moving more away from an ice age than towrds it
2007-03-30 04:53:34
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answer #1
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answered by Imperator 3
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There actually have been several ice ages. An ice age refers to a period of time when the earth's temperature drops and results in a large part of the planet becoming covered with glaciers. The earth's temperature over geologic time frames does fluctuate, hence the global warming sceptics arguments that global warming is not cause by man, but just a natural cycle... There are many reasons why the earth might cool, one of the main age ices followed the extinction of the dinosaurs. It is believed that a large meteor crashed near the yucatan pennisula, the massive collision throwing up enormous amounts of dust and smoke into the atmosphere which blocked out the sunlight.. hence cooling. To a lesser extent large volcanic eruptions have the same effect.
What is perhaps the most scary is that the average decrease in temperature across the globe to cause the difference between present conditions and an ice age is only a few degrees. So again with respect to global warming people monger fear because they point out that only a few degrees cooler causes an ice age, imagine what a few degrees hotter might do!
2007-03-30 11:24:35
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answer #2
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answered by Leonardo D 3
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An ice age is a period of long-term reduction in the temperature of Earth's climate, resulting in an expansion of the continental ice sheets, polar ice sheets and mountain glaciers ("glaciation"). Glaciologically, ice age is often used to mean a period of ice sheets in the northern and southern hemispheres; by this definition we are still in an ice age (because the Greenland and Antarctic ice sheets still exist). More colloquially, when speaking of the last few million years, ice age is used to refer to colder periods with extensive ice sheets over the North American and Eurasian continents: in this sense, the last ice age ended about 10,000 years ago. This article will use the term ice age in the former, glaciological, sense; and use the term glacial periods for colder periods during ice ages and interglacial for the warmer periods.
Many glacial periods have occurred during the last few million years, initially at 40,000-year frequency but more recently at 100,000-year frequencies. These are the best studied. There have been four major ice ages in the further past.
2007-03-30 13:32:44
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answer #3
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answered by Jewl 2
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Ice Age
Crystal Reference Encyclopedia
A period of time in the Earth's history when ice sheets and glaciers advanced from polar regions to cover areas previously of temperate climate. Several ice ages are evident in the geological record, the most recent (‘the Ice Age’) being from c.1 million years ago and lasting until c.10 000 years ago, when the ice retreated to its present polar extent.
http://www.reference.com/search?q=ice%20age
2007-03-30 11:38:39
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answer #4
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answered by fdm215 7
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It was when the polar ice caps grew huge and covered half the world. The cave people had to run south to avoid getting trapped by the wall of ice.
2007-03-30 11:47:28
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answer #5
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answered by Father Wiggly 4
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(There was more than one) Period of cooling in which glaciers cover a larger part of the planet.
Lasts for several thousand years.
2007-03-30 11:20:30
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answer #6
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answered by A Guy 7
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All the info you could possibly need is on the links below. Happy reading!
2007-03-30 11:25:07
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answer #7
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answered by Anonymous
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