How do we know that the climate has changed?
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The rings of even partly fossilized trees buried in bogs can be measured, and these measurements provide accurate records of climate changes over the past 750,000 years. By measuring the radioactivity of once living material, scientists can make accurate measurements up to 40,000 years ago.
Mammoths lived in cool climates, and as the glaciers and cold weather advanced, they moved farther south.Their remains are found in huge numbers in the tundra of Alaska and Siberia.
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Date Added: 12 December '11
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