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Ice Age
Ice Ages are periods in the earth's history when
a significant,
extended cooling of the atmosphere and ocean took place. The earth last
entered such an ice age about 2.5 million years ago, at the beginning of the Quaternary
period.
The term 'Ice Age' is usually applied
to the earlier part of the Pleistocene, and although continental ice sheets withdrew from
North America and Europe about 10,000 years ago, at the end of the this (Pleistocene)
epoch, many scientists believe that the Quaternary Ice Age is not over yet. Paleolithic
man was contemporary with at least the latter periods of this Ice Age, his remains having
been found, together with those of the mammoth and reindeer, in glacial deposits.
Evidence of earlier ice ages also
exists. Since the time of the earliest recorded life on earth about 3.6 billion years ago
the planet's average surface temperature has been about 20° C (about 70° F), with a
range of uncertainty of about 5° C (about 9° F). For more than 90 percent of that time
the earth has been free of ice ages, and no large glaciers have existed except in high
mountains. Ice ages occur about every 150 million years, and last a few million years. The
longest of the ancient ice ages was probably the Permo-Carboniferous, which began about
300 million years ago and affected all southern hemisphere lands. Still earlier, about 435
million years ago, another giant ice sheet extended from Brazil to North Africa and all
the way across to Yemen and Saudi Arabia. Paleomagnetic measurements indicate that the
South Pole then lay in West Africa. About 600 million years ago, yet another great glacial
age occurred. Evidence of these ancient ice ages is provided by layers of tillite, a rock
consisting of hardened glacial drift.
Recommended videos:
Other related titles:
--
How the Ice Age Made the Great Lakes.
--
Click
HERE for more related
videos.
Recommended books:
Other related titles:
--
After the Ice Age: The Return of Life to Glaciated North America.
--
Between Ice Ages.
--
Children of the
Ice Age: How a Global Catastrophe Allowed Humans to Evolve.
--
Frozen Earth:
Explaining the Ice Ages.
--
Ice Age Monsters
(Cave Bear, Woolly Rhinoceros, Megaceros, Glyptodon, Mastodon).
--
Ice Ages:
Solving the Mystery.
--
Journey Through
the Ice Age.
--
The Call of Distant
Mammoths: Why the Ice Age Mammals Disappeared.
--
Click
HERE for more related
books.
Further info:
Ice Ages.
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SKEPTICAL ENQUIRER,
the magazine providing
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fact from myth in the flood of occultism and pseudoscientific theories
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