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When a tree is cut down, these periods are exhibited in a cross section of the trunk in the form of rings.

Simply counting the number of rings will give one a fairly good idea of the age of the tree.

Radioactive carbon thus was visualized as gaining entrance wherever atmospheric carbon dioxide enters—into land plants by photosynthesis, into animals that feed on the plants, into marine and fresh waters as a dissolved component, and from there into aquatic plants and animals.

In short, all parts of the carbon cycle were seen to be invaded by the isotope carbon-14.

The occurrence of natural radioactive carbon in the atmosphere provides a unique opportunity to date organic materials as old as roughly 60,000 years.

There are well-known methods of finding the ages of some natural objects.

Trees undergo spurts in growth in the spring and summer months while becoming somewhat dormant in the fall and winter months.

All dated gravels yielded old ages that suggest several episodes of sediment burial over the past ∼5.3 m.y.

Comparison of burial ages to the overlying 4.4 Ma basalt yielded good agreement and suggests that under the most favorable conditions, cosmogenic burial dating can extend back 4–5 m.y.

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