How do we know that the climate has changed? - FamousWhy
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How do we know that the climate has changed?

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How do we know that the climate has changed? In more recent times, geologists and palaeontologists have been able to make more accurate measurements of the age of ancient rocks. Trees produce a new 'ring' every year, and these can be measured and counted. The width of the ring shows how well the tree grew in any year, reflecting climatic conditions at that time.

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.


Tags: weather, fossils



Category: Education  - ( Education Archive)

Date Added: 12 December '11


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