Process of carbon dating

The rock on the surface of the planet or moon is bent backward, upward, and outward so the amount of material ejected is much larger than the projectile.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.

If you know how frequently craters of a given size are created on a planet or moon, you can just count up the number of craters per unit area.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.Also the pressure from the surrounding solid rock squeezes the molten rock upward.Molten rock contains trapped gases that expand as it rises causing it to rise even faster.

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