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Originally posted by jlc163
Here's what I only posted as reference to the age fo the earth...deal with it. definition of rock-dating, mentions what assumptions go into it:
It's not nice to gang up on people,
How old is the Earth?
About 4.5 billion years based on radio active dating using uranium and thorium isotopes. It could be a little bit older if it formed as a liquid mass, since this state resets nuclear isotope clocks which only date from the onset of a solid phase. The oldest meteorites are about 4.8 billion years old so that is probably the upper limit for the Earth too.
How old is the Earth?
Radioactive dating using uranium decay to lead gives an age near 4.7 billion years, with an uncertainty of about 0.1 billion years either way. The oldest rocks recovered from ancient geological strata are about 3.9 billion years old or thereabouts. The oldest moon rock samples from the lunar highland regions are about 4.2 billion years old. And meteorite samples recovered from many localities indicate ages of 4.5-4.9 billion years for the minerals, or dust grains. Presumably, this meteoritic material dates from a time when the solar system was just forming, and the planets had not as yet begun to appear. The oldest signs of life in the form of fossil bacteria, date from about 3.8 billion years and indicate that life began to appear on the surface of the Earth within about 500 million years after the planet had begun to form a stable crust that allowed radioactive isotopes to be trapped, and allow the possible of radioactive dating to yield ages near 4.5-4.7 billion years.
Computer models suggest that it only takes less than 5 million years to form a planet, but afterwards, the planet is constantly bombarded by small asteroids, so for much of the 500 million years since its formation, and the appearance of life, the surface must have been periodically devastated by tremendous impacts. Some biologists speculate that life may have appeared several times, and each time blasted into oblivion, before the bombardment subsided and life could at last establish itself around 4 billion years ago.
The Creationists are the most troubling of these factions. They have published many pages that purport to show evidence that the Earth is young. They require from a literal reading of the Bible according to THEIR way of reading it, that the Earth must be less than 10,000 years old. To make this work, they have to claim that radioactive dating is a fraud, and leads to conflicting results. They have expertly collected a variety of discordant age estimates, or references to conflicting results in the literature, but when you look closely you will find that their references are either 50-100 years out of date, or they have completely misrepresented the scientific evidence.
Ancient rocks exceeding 3.5 billion years in age are found on all of Earth's continents. The oldest rocks on Earth found so far are the Acasta Gneisses in northwestern Canada near Great Slave Lake (4.03 Ga) and the Isua Supracrustal rocks in West Greenland (3.7 to 3.8 Ga), but well-studied rocks nearly as old are also found in the Minnesota River Valley and northern Michigan (3.5-3.7 billion years), in Swaziland (3.4-3.5 billion years), and in Western Australia (3.4-3.6 billion years). [See Editor's Note.] These ancient rocks have been dated by a number of radiometric dating methods and the consistency of the results give scientists confidence that the ages are correct to within a few percent. An interesting feature of these ancient rocks is that they are not from any sort of "primordial crust" but are lava flows and sediments deposited in shallow water, an indication that Earth history began well before these rocks were deposited. In Western Australia, single zircon crystals found in younger sedimentary rocks have radiometric ages of as much as 4.3 billion years, making these tiny crystals the oldest materials to be found on Earth so far. The source rocks for these zircon crystals have not yet been found. The ages measured for Earth's oldest rocks and oldest crystals show that the Earth is at least 4.3 billion years in age but do not reveal the exact age of Earth's formation.
The accepted view on an infant Earth is that shortly after it first formed 4.5 to 4.6 billion years ago, the planet became little more than a swirling ball of molten metal and rock. Scientists believed it took a long time, perhaps 700 million years, for the Earth to cool to the point that oceans could condense from a thick, Venus-like atmosphere. For 500 million to 600 million years after the Earth was formed, the young planet was pummeled by intense meteorite bombardment. About 4.45 billion years ago, a Mars-size object is believed to have slammed into the Earth, creating the moon by blasting pieces of the infant planet into space.
"This early age restricts theories for the formation of the moon," Valley says. "Perhaps the moon formed earlier than we thought, or by a different process." Another intriguing question is whether or not life may have arisen at that early time. Low temperatures and water are preconditions for life. The earliest known biochemical evidence for life and for a hydrosphere is estimated at 3.85 billion years ago, and the oldest microfossils are 3.5 billion years old.
Originally posted by AD5673
The Earth cant be a billion years old because there would be billions of humans on Earth. In 1900 there were about 1 billion people on Earth. One hundred years later it is nearly 10 billion people on Earth. If humanity is eve maybe 40,000 years old there would be nearly 60-100 billion people on Earth. I dont have a link or anything i just thought this up in my head about the Earth's population. What do you people think?
1. The rate of decay remains constant. 2. There has been no contamination (that is, no daughter or intermediate elements have been introduced or leeched from the specimen of rock). 3. We can determine how much daughter there was to begin with (if we assume there was no daughter to begin with, yet there was daughter at the formation of the rock, the rock would have a superficial appearance of age).
How old is the Earth? About 4.5 billion years based on radio active dating using uranium and thorium isotopes. It could be a little bit older if it formed as a liquid mass, since this state resets nuclear isotope clocks which only date from the onset of a solid phase. The oldest meteorites are about 4.8 billion years old so that is probably the upper limit for the Earth too.
"When uranium decays to lead, a by-product of this process is the formation of helium, a very light, inert gas which readily escapes from rock. Certain crystals called zircons, obtained from drilling into very deep granites, contain uranium which has partly decayed into lead. By measuring the amount of uranium and 'radiogenic lead' in these crystals, one can calculate that, if the decay rate has been constant, about 1.5 billion years must have passed. (This is consistent with the geologic 'age' assigned to the granites in which these zircons are found.) There is a significant amount of helium from that '1.5 billion years of decay' still inside the zircons. This is at first glance surprising, because of the ease with which one would expect helium (with its tiny, light, unreactive atoms) to escape from the spaces within the crystal structure. There should hardly be any left, because with such a slow buildup, it should be seeping out continually and not accumulating. Drawing any conclusions from the above depends, of course, on actually measuring the rate at which helium leaks out of zircons. This is what one of the recent RATE [2] papers reports on. The samples were sent� to a world-class expert to measure these rates. The consistent answer: the helium does indeed seep out quickly over a wide range of temperatures. In fact, the results show that because of all the helium still in the zircons, these crystals (and since this is Precambrian basement granite, by implication the whole earth) could not be older than between 4,000 and 14,000 years. In other words, in only a few thousand years, 1.5 billion years' worth (at today's rates) of radioactive decay has taken place. Interestingly, the data has since been refined and updated to give a date of 5680 (+/- 2000) years." [3]
And this was the article based off his work, written by him:
TAS WALKER, B.Sc.(Hons) [geology], B.Eng.(Hons), Ph.D., worked in power station design and operation, and the geological assessment of coal deposits. He works full-time researching and speaking for Answers in Genesis in Australia.
www.creationism.org... in
One of the products associated with uranium decay is a particular isotope of helium. The best measurements made to date reveal that there is not enough of this type of helium in the atmosphere to support alleged decay of uranium for more than 6000 years.
www.creationism.org...
Other methods, for example, uranium-lead and thorium-lead ages, have been found to result in contradictory evidence. A classic example is that the dust samples on the surface of the moon seem to be older than the rocks underneath (CRSQ , 1971, 8:3, p.203).
The Creationists are the most troubling of these factions. They have published many pages that purport to show evidence that the Earth is young. They require from a literal reading of the Bible according to THEIR way of reading it, that the Earth must be less than 10,000 years old. To make this work, they have to claim that radioactive dating is a fraud, and leads to conflicting results. They have expertly collected a variety of discordant age estimates, or references to conflicting results in the literature, but when you look closely you will find that their references are either 50-100 years out of date, or they have completely misrepresented the scientific evidence.
Originally posted by jhova
Science has proved nothing!And as corrupt as science is today, I'd be surprised to see if we ever find out anything.
Originally posted by jhova
I guarantee that people will start dying at a young age, I believe it is starting already.Good health care huh, who can afford it?Science also omes up with more ways to kill then anything else, or make money, not solving the major issues of the world.
Originally posted by DarkSide
you have all fallen to the disappointement.evolution is a lie!