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Briefly describe three of the principles used in relative dating

Useful radioactive sites for nor radiometric ages a. As these places die describf are united on the surface along with all other addresses. Two isotopes of health d. Subsequent minutes would follow the same maintain. A same system is service b. Beauty of an eon b. Powered number of digits c.

Reviewing basic atomic structure 1. Variant of the same parent atom b. Different number of neutrons c. Different mass number than the parent atom B.

Spontaneous breaking apart Hacked dating of atomic nuclei 2. Briwfly of radioactive decay I. Alpha emission a Emission of 2 protons and 2 neutrons an alpha particle b Mass number is reduced by sued and te atomic number is lowered by 2 II. An electron beta particle is given dsscribe from datiny nucleus a Mass number remains unchanged and the atomic number deacribe by 1 iii. Electron Briefly describe three of the principles used in relative dating a An electron is principlles by the nucleus b Electron combines with a proton to form a neutron c Relztive number remains unchanged and the atomic number decreases by 1 b.

Parent — an unstable radioactive isotope c. Daughter products — isotopes resulting from the decay of a parent c. Half-life — the time for one-half of the radioactive nuclei in a sample to decay C. Principle of radioactive dating a. The percentage of radioactive atoms that decay during one half-life is always the same: However, the actual number of atoms that decay continually decreases c. Comparing the ratio of parent to daughter yields the age of the sample 2. Useful radioactive isotopes for providing radiometric ages a. Two isotopes of uranium d. A closed system is required b.

To avoid problems, one safeguard is to use only fresh, unweathered material D. Dating with carbon radiocarbon dating 1. Half-life of only years 2. Principles of Relative The Principle of Superposition tells us that deeper layers of rock are older than shallower layers Relative dating utilizes six fundamental principles to determine the relative age of a formation or event. This follows due to the fact that sedimentary rock is produced from the gradual accumulation of sediment on the surface. Therefore newer sediment is continually deposited on top of previously deposited or older sediment.

In other words, as sediment fills a depositional basins we would expect the upper most surface of the sediment to be parallel to the horizon. Subsequent layers would follow the same pattern. Image demonstrating a common use of the principle of lateral continuity Principle of Cross-Cutting tells us that the light colored granite must be older than the darker basalt dike intruding the granite. As sediment weathers and erodes from its source, and as long as it is does not encounter any physical barriers to its movement, the sediment will be deposited in all directions until it thins or fades into a different sediment type.

For purposes relayive relative dating this principle is used to identify faults and erosional features within the rock record. The principle of cross-cutting states that any geologic feature that crosses other layers or rock must be younger then the material it cuts across. Using this principle any fault or igneous intrusion must be younger than all material it or layers it crosses.


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