what country can you find the oldest rock?
106284
Canada. \n\nThe problem with calling the zircon crystal from Australia the oldest "rock" is that it is a crystal that came out of much younger rock. The rock in Canada is also dated with zircons, but it is intact, and not eroded away. It is slightly over 4 billion years in age. The rocks the 4.4 billion year old zircon came from are only 3 billion years old sediments, formed by eroding the rock the zircon came from. \n\nSo despite the incredible discovery of the Australian zircons, the Acasta River area,in Canada's  Northwest Territories remains the earth's oldest intact rock that we know of.  Unless of course you are willing to call a mineral a rock, in which case Australia wins. \n\nTo demonstrate my point, I quote Wikipedia:\n"Zircon is a mineral belonging to the group of nesosilicates. Its chemical formula is ZrSiO4."
675720
The currently accepted estimate is 4.5 to 4.6 billion years old.  Radiometric dating of Earth rocks can't get us there because the surface of the Earth has undergone so much upheaval.\n \nInstead, moon rocks and meteorites are used to estimate the age of the Earth, because it appears that all of the solar system formed at about the same time.\n\nCarbon dating is of no use here; it only works for organic material and it can't date back further than 50,000 years or so. Long-lived radioactive elements such as uranium are used instead.
1057852
It takes a very long time.  The oldest fossils are about 3.5 billion years old, but many are not nearly that old.  The youngest are probably only about 23 million years old or even less.\n\nThese links are helpful.
234955
The very oldest species on Earth are the cyanobacteria, which seem to have been around virtually unchanged for nearly 4 billion years. This is based on fossils of that age that have been compared under high-powered microscopes to existing species of these bacteria. Other bacteria that are about as old are the archaea, which thrive in acidic, high- temperature, or high-radiation environments. \n\nAnother remnant of ancient organisms includes the stromatolites, mounds of algae and bacteria that today grow in the Bahamas, Shark's Bay Australia, and a few other limited environments. They have been around, also largely unchanged, for over 3 billion years and at one time were the Earth's dominant form of life. \n\nOn the animal side of things, the brachiopod Lingulaa is probably the oldest, having existed nearly unchanged for over 500 million years, and the horseshoe crab (limulus) has been on the planet for several hundred million years, too. Since the average "lifespan" of a species is only a few million years, having such ancient species around is very impressive. \n\nA good book about the earliest life is "Cradle of Life" by J. William Schopf. He is one of the premier scientists doing this sort of research. At a more advanced level, he has edited two scientific books, "Earth's Earliest Biosphere" and "The Proterozoic Biosphere", which should be in your university's geology or science library.
93944
The oldest fossil evidence for life on Earth is found in 3.5 billion year old rocks in the Pilbara region of Western Australia. Along with rocks of similar age in South Africa these are the oldest well preserved sedimentary rocks known. The evidence for fossil life takes the form of: \n\nstructures called stromatolites which are believed to be the fossilized remains of laminated structures built by colonies of micro-organisms. Modern examples of such colonies are found in Shark Bay in Western Australia \nmicrofossils of individual micro-organisms. \ncarbon isotope ratios indicative of biological activity. \nSome recent results include the discovery of 3.45 billion year old stromatolites by scientists of the Geological Survey of Western Australia, and the reporting of microfossils from a deep sea hot spring deposit of age 3.2 billion years by Birger Rasmussen of the University of Western Australia.\n\nWhile controversy surrounds many of the reports of fossils of this age, it is generally accepted that there is sufficient evidence to be reasonably sure that life was well established on earth at about 3.5byr ago. Older rocks at 3.8byr age in Greenland are too greatly deformed to preserve fossils but have been claimed to show evidence for life in their carbon isotope ratios.\n+\nFUNGI and algae first teamed up to form lichen 600 million years ago, according to newly discovered fossils from China. This makes them slightly older than the first fossils of complex soft-bodied animals, and far older than land plants.\n\nLichens are the product of a symbiotic relationship between algae, which produce food, and fungi, which provide moisture, nutrients and a protective framework. The new fossils come from south China, and were laid down in shallow seawater (Science, vol 308, p 1017).
1072956
The oldest one in the country is in Maine\nPoland Spring Resort's Golf Course is considered the Oldest Resort Course in America.
1104836
Precambrian for the Black Hills. That's anything from 542 million years (the start of the Cambrian) and back. The Rockies in Wyoming are Paleozoic to Mesozoic in age. If you want to know specifics then contact the USGS in Wyoming because they would be the people who would know the right answer. \n\nAnd for the record rocks aren't as old as the Earth because they are re-crystallized/partially melted to form new rocks. They are not the same rocks they were before and we pick up more sediments and minerals from cosmic bombardment.
947510
Diamonds are also found in Russia, Australia, and Brazil. They are all between a billion and three billion years old, having formed at least 90 miles below the earth's surface and been carried to the surface in magma pipes. \n\nThe park mentioned by others is Crater of Diamonds State Park near Murfreesboro, Arkansas. I dug for diamonds there when I was twelve years old. My advice to everybody else: find out what diamonds look like in the rough before you start digging!  A visitor from Wisconsin found a "flawless 5.47-carat, canary yellow diamond" there last month. Lucky she was digging at the only diamond mine in the world that lets the general public dig for diamonds and keep what they find!
1116645
the oldest that we can find and have full knowledge of it.is VEDA.\nit is about 7500 years old,with some fascinating transcript of general belief of this religion
244377
I am thinking the city of Jericho is one of the oldest cities.\nBUT we have signs of Indo Eruopean civilizations 10,000 years old and older.
826729
its been millions of years
784871
Well, maybe a little, but if they have it, it is really old and altered.  Below is a link to the geologic map.
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Modern geologists, based on extensive and detailed scientific evidence, consider the age of the Earth to be around 4.567 billion years (4.567×109 years). This age represents a compromise between the oldest-known terrestrial minerals – small crystals of zircon from the Jack Hills of Western Australia – and astronomers' and planetologists' determinations of the age of the solar system based in part on radiometric age dating of meteorite material and lunar samples.\n\nThe radiometric age dating evidence from the zircons further confirms that the Earth is at least 4.404 billion years old. Comparing the mass and luminosity of the Sun to the multitudes of other stars, it appears that the solar system cannot be much older than those rocks. Ca-Al-rich inclusions (inclusions rich in calcium and aluminium) – the oldest known solid constituents within meteorites which are formed within the solar system – are 4.567 billion years old, giving an age for the solar system and an upper limit for the age of the Earth. It is assumed that the accretion of the Earth began soon after the formation of the Ca-Al-rich inclusions and the meteorites. Since the accretion time of the Earth is not exactly known yet, and the predictions from different accretion models vary between several millions up to about 100 million years, the exact age of the Earth is difficult to define.\n\nIn the centuries preceding the scientific revolution, the age of the Earth was determined from the accounts of creation by religious authority. Today some religious groups continue to accept only theological accounts regarding the age of the earth, rejecting scientific evidence which contradicts their beliefs.
694236
It depends on what you are looking to find. Big Bend has an olivine granite, which is very rare. The Guadalupe Mountains have the world's largest exposed barrier reef. These are two great geological features in my home state. Almost any national park can claim something unique. Just look at the Grand Canyon with its great sedimentology. The best geology is a relative term.
178387
Current models of Solar System formation indicate that all the  solid objects in the solar system (planets, moon, asteroids, etc) formed around the same time.  The oldest, unaltered piece of solid material we have found is about 4.6 billion years old (it is a particular type of meteorite).  So we place the formation of the Earth at the time period.\n\nWe can't find any Earth rocks that old, as earth has experienced far to much volcanic and techtonic activity in the past to preserve any of these original rocks.  We can and do find rocks as old as 3.8 billion years in the northeast portions of Canada, and even older samples have been found in the Australia region.
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Totally, completely, 100% incorrect information!  Where do you get this nonsense from?\n\nThe oldest observatory in the world was excavated in north China's Shanxi province, and is believed to be 4,100 years old, predating the formerly oldest known observatory from South America.\n\nWhat is well known is that the Arab world gave us our current number system, and the concept of zero.
774612
The "half-life" of an element is important for determining the absolute age of a rock.\n\nThe answer is C.