Review#9 earth's history
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Transcript of Review#9 earth's history
![Page 1: Review#9 earth's history](https://reader036.fdocuments.in/reader036/viewer/2022083003/558e55291a28ab53508b458c/html5/thumbnails/1.jpg)
L.O: EARTH’S HISTORY
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EARTH’S EARLY ATMOSPHERE FORMED FROM OUT GASSING OF VOLCANOES.
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Geologists have sequenced the geologic events in past to develop a geologic history of Earth.
Scientists use relative age and absolute age to determine age of
fossils.
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Relative age: the age of a fossil, rock or geological event in comparison to another.
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absolute age: the real age of a fossil.
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Index fossils: fossils used to determine relative age of other fossils, rocks and events.
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a good Index fossil: wide-spread & lived short time period
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Volcanic ash also is a good time marker. Like index fossils wide-spread. Short time period.
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Now complete page 102-113
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Radioactive decay:
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Radioactive elements:
• Radioactive element decay.• The amount of time it takes for half of a
radioactive element to decay is half-life.• The half-life of an element cannot be changed.• The half-life of carbon 14 is 5,700 years.• The half-life of uranium 238 is 4.5 billion years.
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Carbon 14
• Half-life 5,700• Used to date recent fossils-less than 50,000
years.
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Uranium 238
• Halflife 4,500,000,000 years.• Uranium’s half life is how we know earth’s age.
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