Set The Stage For Ice Age

Deshawn Ballard and Danielle Albright

When was the last ice age?

There has been a series of ice ages over the past million years or so. More accurately, the ‘last ice age’ refers to the most recent of these glacial episodes. This global descent into cold climate started about 100,000 years ago and ended 11,700 years ago. That whole period can be regarded as the last ice age, though it was also complex, with varying climate. The coldest part, when massive glaciers extended as far south as Britain, happened between 25,000 and 20,000 years ago; we call it the last glacial maximum. An ice age is a long interval of time (millions to tens of millions of years) when global temperatures are relatively cold and large areas of the Earth are covered by continental ice sheets and alpine glaciers. Within an ice age are multiple shorter-term periods of warmer temperatures when glaciers retreat (called interglacials or interglacial cycles) and colder temperatures when glaciers advance (called glacials or glacial cycles).

How The Earth Has Changed

Earth is warmer today than it has been for most of the last 11,300 years, new research has shown.

Scientists studied fossils recovered from 73 sites around the world to track global climate to the end of the last Ice Age.

They found that for 70% to 80% of this period, which dates back to the start of the Holocene era in which we now live, temperatures were cooler than they are now.

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Click here to watch a video on how the earth/environment has changed :) :D


The evidence for past Ice Ages lies everywhere in the Northern Hemisphere: in lands scraped and gouged by glaciers, in pothole lakes, in piles of gravel, sand, or loess, in high shorelines surrounding arid basins. These artifacts can be found far from active glaciers or ice caps; aditional evidence is found in the remaining glaciers themselves, and in the great ice caps of Greenland and Antartica. Cave lion ,uintatherium have gone extinct during the ice age.

was there an astronomical event that began the ice age??

Researchers have generated a lot of theories to explain the mysteries surrounding the mammoths, but questions about the cause of the ice age have also spawned a multitude of ideas. Ice Age theories can be divided into two general groups. one group is extraterrestrial ----- something happened in our solar system or the milky way galaxy or even on the sun to start an ice age. The second group of theories is terrestrial. They propose that something in Earth's complex climate changed to start an ice age.

The Story Of The Ice Age

Imagine yourself in a time machine, going back in time about 20,000 years. You get out of the machine and all you can see is ice. All around you are miles and miles of ice. You'd think you must have landed on a glacier or frozen lake. Actually, you are in the ice age.

About 1/3 of the earth was ice. The most recent ice age was almost 10,000 years ago. As the earth started warming up the ice started to melt. The last ice age left traces that it was there. It left GLACIERS!!! Sheets of ice covered valleys and rivers. Ice spread to different parts of the world. Scientists called it the ice age. It kept melting, then froze again. This went on for about a million years. About 10,000 years ago the earth started to warm up. Sheets of ice started to melt. As the ice melted it left lakes and broad valleys with a mixture of rocks and soil. The only ice left was up high in the mountains. The glaciers that you see now are what is left over from the ice age.

Do you ever wonder how we know that ice ages really exist? Well one reason is that it left clues. Louis Aggasiz was one of the first scientists to study the clues of the ice age. An erratic is a large boulder, and when Agassiz told some scientists that the boulders had been left there by a glacier they thought that he was out of his mind. The scientists thought they were put there by icebergs, Noah's flood, and witches.

The reason Louis Agassiz proved that they had been put there by glaciers is because they were made of a kind of rock that you can't find naturally in that area - granite. Because of that he proved that they can't be from there, they were from somewhere else. Other proof that the ice age really existed is: polished bedrock, sand and gravel piles, big valleys, and rough mountain tops.