Carbon dating used determine age earth


04-Dec-2017 01:19

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The oldest fossil evidence of ancient organisms dates back to 3.5 billion years ago and evidence for biological activity based on isotopic ratios of carbon date back to about 3.85, even up to 4.2 billion years ago, though the carbon isotope ratio evidence is controversial.

The number of craters per unit area on a surface can be used to determine an approximate age for the planet or moon surface if there is no erosion.

The last stage of that "sweeping up", called the occurred from about 4.1 to 3.8 billion years ago.

Impacts as large as the one that led to the demise of the dinosaurs in much more recent history were happening about once a month.

Also the pressure from the surrounding solid rock squeezes the molten rock upward.

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Large craters will have a central peak formed by the rock beneath the impact point rebounding upward and they may also have terracing of the inner walls of the crater from the collapsing of the crater rim inward.

Terrestrial planets have hard surfaces that can be re-shaped by several different processes: impact cratering, volcanism, erosion, and tectonics.