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Radiometric dating is used to find the exact ages of rocks or fossils in different layers.

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The Law of Superposition states that you can compare the relative ages of things based on the position of the rock layer they are in. The oldest layers are on the bottom and the youngest layers are on the top.

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Relative time is recorded in rocks

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the oldest layer of rock ends up at the bottom and the youngest end up at the top. it's referred to as the law of superposition.

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The Earth is billions of years old.

The law of superposition states that the newest layer of rock is on the top, and the oldest layer is on the bottom.

Radiometric dating is used to help find the exact date of an organism.

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Each of rock layers represents a period of time in Earths history

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Earth's history can date back to billions of years ago.

The law of superposition states that rocks lower in the earth are  older, which can help us tell the timeline of the earth.

Radiometric dating gives us exact dates for rocks and fossil.

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Each rock layer represents a period if time in Earth's history, so the entire sequence of layers is another timeline.

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Early Land Plants formed 420,000,000 years ago

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The Largest mass extinction was 248 million years ago

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Earth's history started billions of years ago.

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BY looking at events in order, we sometimes see connections between one event  and another.

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The history of the earth started 4,600,000,000 years ago
Relative order shows the events in order but it does not show the actual dates of the events
The law of superposition gives us the relative age of the fossils but radiometric dating gives us the absolute date

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The earliest life on earth was 3,900,000,000

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The Pre-Archean was the time period before the Archean, and there is no evidence of life in that time period.

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Earth is billions of years old,  nearly 5 billions years.

Humans were one of the latest of species to become known to Earth.

Superposition allows us to determine the age of fossils.

Eras are a time that we can refer to if we were talk talk about a certain time period

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The earth and moon formed 4,600,000,000 years ago

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Earth's history is Billions of years old

fossils buried in rocks are evidence for the events in history

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1. Earth's History goes back billions of years.
2. Earth's earliest life was 3,900,000,000 years ago.
3.Earliest land plants were seen 420,000,000 years ago.
4. Earth's largest mass extinction was 248,000,000 years ago.
5. Dinosaurs went extinct 65,000,000 years ago.
6. Early hominid was found 4,000,000 years ago.
7. By looking at events in order we can sometimes see connections.
8. Rock layers can represent periods of time.
9. Fossils buried in rock layers are evidence of Earths early history.
10. Radiometric dating give absolute dates.
11. Geological time scale is like a timeline and it shows eon area and period.

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By looking at events in order, we sometimes see connections between one event and another.

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Earliest life was 3.9 billion years ago.