List the laws and principles used in relative dating

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Basic concepts of chemistry are essential to understanding the physical and chemical properties of earth materials minerals, rocks, organic matter, etc. The chemical characteristics of earth materials are reflect the environments how and where they are formed, they also determine their potential fate when exposed to chemical changes. For instance, rocks and minerals formed deep underground may not be stable in the surface environment where they are exposed to water, air, temperature changes, and other physical and chemical conditions.

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There are two types of age determinations. Geologists in the late 18th and early 19th century studied rock layers and the fossils in them to determine relative age. William Smith was one of the most important scientists from this time who helped to develop knowledge of the succession of different fossils by studying their distribution through the sequence of sedimentary rocks in southern England.

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InNiels Stensenbetter known then and now by his Latinized name Nicolaus Steno, formulated a few basic rules that helped him make sense of the rocks of Tuscany and the various objects contained within them. His short preliminary work, De Solido Intra Solidum Naturaliter Contento — Dissertationis Prodromus Provisional report on solid bodies naturally embedded in other solidsincluded several propositions that have since become fundamental to geologists studying all kinds of rocks. Three of these are known as Steno's principles, and a fourth observation, on crystals, is known as Steno's Law.

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Relative dating is the science of determining the relative order of past events i. In geology, rock or superficial depositsfossils and lithologies can be used to correlate one stratigraphic column with another. Prior to the discovery of radiometric dating in the early 20th century, which provided a means of absolute datingarchaeologists and geologists used relative dating to determine ages of materials.

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On this page, we will discuss the Principles of Geology. These are general rules, or laws, that we use to determine how rocks were created and how they changed through time. We also use these laws to determine which rock formations are older or younger.

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Furthermore, the results of processes today are the same as the results of the same processes millions of years ago. This means that we can take our observations of processes that occur today, and observations of the results and know the process that formed it when we see that same result in the rock record. For example, you can look in a stream and see ripple marks in the sand, formed by the flow of water over the sand. If you see ripple marks in the rock record, you can know that a similar process was at work.

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Nicolaus Steno introduced basic principles of stratigraphythe study of layered rocks, in William Smithworking with the strata of English coal Former swamp-derived plant material that is part of the rock record. The figure of this geologic time scale shows the names of the units and subunits.

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