In fact, electromagnetism and the weak nuclear force have been shown to be different facets of the same fundamental force, and many scientists believe that the strong force can be unified with this electroweak force, too. Gravity is best explained using Albert Einstein's Theory of General Relativity, which is not a quantum theory.
To deal with many of these problems geologists utilize two types of geologic time: relative time and absolute time.
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The most obvious feature of sedimentary rock is its layering.
This feature is produced by changes in deposition over time.