Decay routes[ edit ] The above uranium to lead decay routes occur via a series of alpha and beta decays, in which U with daughter nuclides undergo total eight alpha and six beta decays whereas U with daughters only experience seven alpha and four beta decays. The term U—Pb dating normally implies the coupled use of both decay schemes in the ‘concordia diagram’ see below. However, use of a single decay scheme usually U to Pb leads to the U—Pb isochron dating method, analogous to the rubidium—strontium dating method. Finally, ages can also be determined from the U—Pb system by analysis of Pb isotope ratios alone. This is termed the lead—lead dating method. Clair Cameron Patterson , an American geochemist who pioneered studies of uranium—lead radiometric dating methods, is famous for having used it to obtain one of the earliest estimates of the age of the Earth. Mineralogy[ edit ] Although zircon ZrSiO4 is most commonly used, other minerals such as monazite see: Where crystals such as zircon with uranium and thorium inclusions do not occur, a better, more inclusive, model of the data must be applied. These types of minerals often produce lower precision ages than igneous and metamorphic minerals traditionally used for age dating, but are more common in the geologic record. Interaction between mineralogy and radioactive breakdown[ edit ] During the alpha decay steps, the zircon crystal experiences radiation damage, associated with each alpha decay.
These are K-Ar data obtained on glauconite, a potassium-bearing clay mineral that forms in some marine sediment. Woodmorappe fails to mention, however, that these data were obtained as part of a controlled experiment to test, on samples of known age, the applicability of the K-Ar method to glauconite and to illite, another clay mineral.
He also neglects to mention that most of the 89 K-Ar ages reported in their study agree very well with the expected ages. Evernden and others 43 found that these clay minerals are extremely susceptible to argon loss when heated even slightly, such as occurs when sedimentary rocks are deeply buried. As a result, glauconite is used for dating only with extreme caution.
Power As we discussed earlier, power is the rate of energy transfer. The rate at which something happens is the “something” divided by the time–for example, miles/hour = miles per hour, or .
This age is obtained from radiometric dating and is assumed by evolutionists to provide a sufficiently long time-frame for Darwinian evolution. And OE Christians theistic evolutionists see no problem with this dating whilst still accepting biblical creation, see Radiometric Dating – A Christian Perspective. This is the crucial point: Some claim Genesis in particular, and the Bible in general looks mythical from this standpoint.
A full discussion of the topic must therefore include the current scientific challenge to the OE concept. This challenge is mainly headed by Creationism which teaches a young-earth YE theory. A young earth is considered to be typically just 6, years old since this fits the creation account and some dating deductions from Genesis. The crucial point here is: Accepted Dating Methods Here we outline some dating methods , both absolute and relative, that are widely accepted and used by the scientific community.
Absolute dating supplies a numerical date whilst relative dating places events in time-sequence; both are scientifically useful. Radiometric Dating This is based upon the spontaneous breakdown or decay of atomic nuclei.
January Fossils provide a record of the history of life. Smith is known as the Father of English Geology. Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.
How radiometric dating works in general: Radioactive elements decay gradually into other elements. The original element is called the parent, and the result of the decay process is .
Army’s MBT program, the first M1 rolled off the assembly line in After two years of acceptance trials, the first of these vehicles was delivered to the US Army on February 28, By , evaluations of field service had prompted the first modification requests, and production shifted to the M1A1. The first M1A1’s were delivered to units in August of The Army has converted older M1s to M1A2s.
An additional M1s are being upgraded to A2s under a five-year contract awarded in FY , with a total of M1 upgrades planned. It includes a mm smoothbore main gun, an NBC overpressure protection system, and an improved armor package. This tank significantly increases the capabilities of the Fleet Marine Forces across the full spectrum of conflict in the near and midterm. Engagement ranges approaching meters were successfully demonstrated during Operation Desert Storm.
The primary armor-defeating ammunition of this weapon is the armor-piercing, fin-stabilized, discarding sabot APDS-FS round, which features a depleted uranium penetrators. Depleted uranium has density two and a half times greater than steel and provides high penetration characteristics.
Changing Views of the History of the Earth
At the time that Darwin’s On the Origin of Species was published, the earth was “scientifically” determined to be million years old. By , it was found to be 1. In , science firmly established that the earth was 3. Finally in , it was discovered that the earth is “really” 4.
Radiocarbon Dating: Its Limitations and Usefulness “Combining the effects of these two trees, we see a site that was actually occupied for years (from to BCE) appearing – using conventional radiocarbon dating – to have been occupied for 30, years (from 40, to 9, BCE).”.
As with all cruise missiles, its range is a function of payload, propulsion, and fuel volume, and can thus vary greatly. Alpha particle A positively charged particle ejected spontaneously from the nuclei of some radioactive isotopes. It has low penetrating power and a short range a few centimeters in air. The most energetic alpha particle will generally fail to penetrate the dead layers of cells covering the skin and can be easily stopped by a sheet of paper. Alpha particles are hazardous when an alpha-emitting isotope is inside the body.
Al-Qaeda or Al-Qa’ida A radical Islamist terrorist organization established by Osama bin Laden now deceased , responsible for a number of attacks in the United States and worldwide, including the September 11, attacks on the World Trade Center and Pentagon. Antarctic Treaty The Antarctic Treaty was opened for signature on December 1, , and entered into force on June 23, The Antarctic Treaty internationalizes and demilitarizes the Antarctic continent. It specifies that Antarctica be used for peaceful purposes only; all activities of a military nature, including testing of any type of weapon, are prohibited.
No military activities, armaments, or prohibited nuclear activities have been observed on the continent during inspections by member states since the treaty went into force.
Changing Views of the History of the Earth
Fantasies, Falsehoods, and Fear-Mongering about Iran’s Nuclear Program “To tell deliberate lies while genuinely believing in them, to forget any fact that has become inconvenient, and then, when it becomes necessary again, to draw it back from oblivion for just so long as it is needed, to deny the existence of objective reality and all the while to take account of the reality which one denies — all this is indispensably necessary. For nearly thirty years now, U. If these warnings are to be believed, Iran is only a few years away from unveiling a nuclear bomb
RADIOMETRIC DATING. he question of the ages of the Earth and its rock formations and features has fascinated philosophers, theologians, and scientists for centuries, primarily because the answers put our lives in temporal perspective.
Carbon , Radiometric Dating and Index Fossils Carbon dating is used to determine the age of biological artifacts up to 50, years old. This technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils like those of the dinosaurs alleged to be millions of years old. This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers.
Carbon dating has been used successfully on the Dead Sea Scrolls, Minoan ruins and tombs of the pharaohs among other things. Carbon is a radioactive isotope of carbon. The half-life of carbon is approximately 5, years. The short half-life of carbon means it cannot be used to date fossils that are allegedly extremely old, e.
The Age of the Earth
The various dating techniques available to archaeologists by Michael G. Furthermore, when you consider that many archaeological sites will contain numerous types of artifacts that permit the use of multiple dating methodologies, a modern archaeologist can often employ cross-dating methodologies which can allow for extremely accurate dating as far back as 10, years in some regions.
Natural Dating Techniques A modern archaeologist has almost half a dozen natural dating techniques that she can apply in the field that she can use to quickly determine an approximate date range, which, in the cases of varve analysis and dendrochronology, can often be used to decrease the date range estimate to a matter of just a few years. One of the oldest natural dating techniques is geochronology, which is based on the principle of superposition — an object, or layer, on top must have been placed there at a later point in time.
Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods. Some critics, particularly religious fundamentalists, argue that neither fossils nor dating can be trusted, and that their interpretations are better.
However, much has happened since it went up, including the Blogger outage. Scroll down for a report on that. More new posts will be added below this one. The essay below is the conclusion of the ninth part in a series by Takuan Seiyo. See the list at the bottom of this post for links to the previous installments.
Their main endeavor has been to enforce their compulsory e. K and discretionary e. Nor the evils of the worldwide Islamic Inquisition which — not in the 16th century but now, in the 21st, condemns Muslim apostates to barbaric execution. Instead, aggressive White androphobes of all genders which I can no longer count are decimating the philogynous and egalitarian West. Equality psychos are tearing down the most egalitarian society that ever existed except for initial communist experiments, before they turned bloody.
American Jews, at the apex of the greatest fortune and philosemitic tolerance their long diaspora has ever bestowed on their kind, are busy supporting all the ideologies and policies that demolish their safe harbor and build up their Muslim, Black and Third World enemies. Leftoid masochists and the Christian meek call for returning Hawaii to the Hawaiians and capitulating before a massive Mexican reconquista of one-third of America. The rightful Etruscan landowners are not bearing angry placards in front of the Vatican.