Outline the methods used for dating fossils and rocks using k

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Tiffany Denham. In part one of this series we discussed two dating methods that are used to calculate the ages of rocks and fossils- relative and absolute. What are these assumptions underlying radiometric dating? The first assumption is that the rate of radioactive decay is known, and has been constant, since the rock formed.
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Control of fire by early humans

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Evidence of common descent

Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy layers of rock are called strata. Relative dating does not provide actual numerical dates for the rocks.
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This preview shows page 1 out of 1 page. Unformatted text preview: Fossil bacteria and algae, casts of jellyfishes, sponges spicules, soft corals, and flatworms are found in Precambrian rocks. Mostly microscopic Evolutionary Trends The fossil record shows that species arise and go extinct repeatedly throughout geological history. Trends appear in the fossil record — directional changes in features or patterns of diversity. Evolutionary Trends The evolution of horses from the Eocene epoch
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