The earth is old... Over 4.6 billion years old!
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Transcript of The earth is old... Over 4.6 billion years old!
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The earth is old...
Over 4.6 billion years old!
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Scientists use a technique called radiometric dating!
This uses different isotopes of various elements such as carbon (carbon dating) and lead.
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The oldest rocks which have been found so far are about 3.9 billion years old.
Some of these rocks include minerals which are as old as 4.2 billion years.
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Let’s take a look at some important events throughout the history of the earth
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4.6 billion years ago: earth is formed, along with the other planets.
3.7 billion years ago: earth's crust solidified (104).
3.5 billion years ago: first life appears in oceans (120).
1.9 billion years ago: first cells with nuclei appear in oceans (248) .
0.65 billion years ago: first multicellular organisms appear (348) .
0.5 billion years ago: first land plants with inner vessels (359) .
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245 million years ago: Dinosaurs appear (380)
200 million years ago: Pangaea breaks up (388)
65 million years ago: Age of Dinosaurs ends, (394)
3.5 million years ago: First proto-humans appear, in Africa (3.1 cm from end)
100,000 years ago: First Homo sapiens appears(1 mm from end)
10,000 years ago: Recorded human history begins(0.1 mm from end)
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the history of the earth.... in a roll of toiler
paper!
400 sheets long
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