What Elements Were Instrumental In Dating The Age Of The Earth
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Geologic Time: Age of the Earth - USGS
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The ages of Earth and Moon rocks and of meteorites are measured by the decay of long-lived radioactive isotopes of elements that occur naturally in rocks and minerals and that decay with half lives of 700 million to more than 100 billion years to stable isotopes of other elements . These dating techniques, which are firmly grounded in physics and are known collectively as radiometric dating , are used to measure the last time that the rock being dated was either melted or disturbed . . .
Because of their unique decay rates, different elements are used for dating different age ranges . For example, the decay of potassium-40 to argon-40 is used to date rocks older than 20,000 years, and the decay of uranium-238 to lead-206 is used for rocks older than 1 million years .
What key discovery, then, allowed geologists to begin assigning absolute age dates to rocks and ultimately discover the age of the Earth ? The answer is radioactivity . Radiometric dating
A musical instrument is used to make musical sounds .Once humans moved from making sounds with their bodies — for example, by clapping—to using objects to create music from sounds, musical instruments were born . Primitive instruments were probably designed to emulate natural sounds, and their purpose was ritual rather than entertainment . The concept of melody and the artistic pursuit of . . .
Precise isotopic ages are called absolute ages , since they date the timing of events not relative to each other but as the time elapsed between a rock-forming event and the present . Absolute dating by means of uranium and lead isotopes has been improved to the point that for rocks 3 billion years old geologically meaningful errors of less than ±1 million years can be obtained .
A number of methods based on radioactive decay have been used to determine the absolute age of the Earth . Of these, methods based on Uranium-Lead, Thorium-Lead, Rubidium-Strontium and Potassium-Argon involve the determination of exact amounts of the parent-daughter elements of the system .
The idea that these four elements - earth , water, air, and fire - made up all matter was the cornerstone of philosophy, science, and medicine for two thousand years (kids love to ask questions on the elements ) . The elements were "pure" but could not be found in that state on earth . Every visible thing was made up of some combination of earth , water, air, and fire . The four elements were even used to described the four temperaments a person could have, and Hippocrates used the four . . .
Techniques such as superposition and index fossils can tell you the relative age of objects, which objects are older and which are younger . Geologists use a variety of techniques to establish absolute age , including radiometric dating , tree rings, ice cores, and annual sedimentary deposits called varves .
The best means of estimating the age is provided by the Uranium- lead, Rubidium-strontium and Potassium-argon methods . On the basis of the data provided by the radioactive methods described above, the age of the earth has been estimated to be of 4500 million years i,e 4 .5 billion years .
This is true even if the earth really is 4 .5 billion years old . In the atmosphere of the earth , Ar40 constitutes 99 .6% of the total argon . This is around 100 times the amount that would be generated by radioactive decay over the age of 4 .5 billion years . Certainly this is not produced by an influx from outer space .
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What Elements Were Instrumental In Dating The Age Of The Earth
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