Dating of rocks fossils and geologic events answer

Relative geologic age is established, based on such evidence as the order in which layers of sediment are stacked, with the younger layer originally on top.

Stratigraphy started to become a formal science due to the work of a man who published under the name Nicolas Steno in the 17th century.A few centimeters a year, about the rate your fingernails grow, may not seem like much but, as millions of years of geologic time unfold, it adds up to thousands of kilometers .Fast or slow, abrupt or taking millions of years, uniformitarianism includes natural processes of all different rates, from abrupt and cataclysmic to barely detectable and very slow.Uniformtarianism does not require that all geological processes are slow.Some are abrupt, such as an explosive volcanic eruption, an earthquake, or a landslide.

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