Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4. Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free. These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.
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Relative Dating, its where the paleontologists date the fossils according to the layer of soil that the fossil was found compared to other fossils that were carbon dated that were in the same soil layer. Because they give us the best estimate of how old all the other fossils are in that sedimentary layer. Absolute dating tells when the fossil was formed, relative dating compares fossils to other fossils, some fossils cannot se absolute dating so they have to use both relative and absolute dating together.
The age of fossils can be determined using stratigraphy, biostratigraphy, and radiocarbon dating. Paleontology seeks to map out how life evolved across geologic time. A substantial hurdle is the difficulty of working out fossil ages. There are several different methods for estimating the ages of fossils, including:.
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The natural forces that form sedimentary rock can also reveal fossils that have been hidden in layers of rock for millions of years. Forces inside Earth lift rocks up into mountain ranges, where wind, rain, and running water erode the rock. Bit by bit, water and wind wear away the upper, younger layers, exposing the older fossil-bearing layers beneath.
How do scientists know the ages of things that lived long before humans existed? The theory of evolution through natural selection is arguably the most important concept in all the life sciences. This fundamental idea has been derived and confirmed through more than years of observations and countless experiments.
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