where can be found the oldest rock on earth?
114800
Yes, as he says, it was a zircon crystal, also known as a MINERAL and not a rock. \n\nThe oldest rock is in Canada, and is dated using zircon crystals at slightly over 4 billion years. It is in the Northwest Territories, and is the oldest known uneroded rock. The rock the Australian zircons came from is a 3 billion year old sedimentary rock.  I mean no disrespect to the zircons found in Australia, but for all we know they may have come from the rock now in Canada if they were both part of the same area of the supercontinent of Rodinia or whatever supercontinent preceeded Rodinia. I am speculating here about prior supercontinents to Rodinia, but if plate tectonics were active between 3 and 4 billion years ago that could be true.
89364
The largest is Tokyo, Japan.\n\nDamascus, Syria is the oldest.
34630
There are rocks older than 3.5 billion years on all continents, but the oldest found so far is Acasta Gneisses in northwestern Canada near Great Slave Lake (4.03 billion years old). \n\nOne of the oldest forms of life on earth is the stomatolites (3.5 billion years old or so), which are still found living in western Australia and a few other places.
465462
OK, first geography is NOT geology *sigh*\n\nLook up carbon dating; you can either tell by the degradation of carbon or by basic layering (what's on the bottom is older than what's on the top).
66333
Earth is way older than radiocarbon dating can determine, i.e. way older than 60,000 years.\n\nSedimental rocks show evidence of the magnetic cycles of earth which reach back into the pre-cambrium.\n\nThorium decay is used for dating ancient rocks, and Thorium decay has been put into relation with these cycles. While not perfect, this method has so far given good evidence.
166876
I figure the only places left are some of the more inaccesable dense rainforests of the South American continent. But the other possibility would be underground, cavers or speliologists have been trying to probe the depths of the earth by exploring underground caves and tunnels as well as flooded waterwaters to see how far they can go below the earth. That besides the oceans must be the last place where humans have never ever set foot on in this earth.
121950
it has been there for thousands of years
858820
Some rocks are formed from magma (lava) that comes from deep in the earth. THose rocks never have fossils because, hey, they were like, 2000 degrees and anything close to them was burned totally. \n\nSome rocks were formed from deposits at the bottom of ponds, rivers, mud flats along the ocean, and in the shallow ocean. Those kinds of rocks (shale, limestone) can have lots of fossils. Let's say that you had a pond at the end of a river where it meets the sea. Lots of dead stuff could float down the river and get caught in the mud. Then it would gradually get covered by more mud. After thousands or millions of years the mud would be really thick. It would be formed into rocks with the remains of the dead animals in it. Bingo. That's a fossil. \n\nThere are lots of grat books about fossils. Check it out at your local library. And most places in the USA there are rocks near you where you could go and dig up your own fossils. That would be cool.
365341
The youngest rocks will be found next to Divergent Tectonic Plate Boundries, such as the Mid Atlanitc Ridge, where upwelling mgama is pushing two plates apart.  The oldest rock will be found in subduction zones where one plate is pushed under another and back towards the mantle.
784871
Well, maybe a little, but if they have it, it is really old and altered.  Below is a link to the geologic map.
26567
THE OLDEST FOSSILS OF MODERN HUMAN  HOMO ERECTUS WERE FOUND IN OLDUVAI GORGE BY THE LEAKEYS .  I BELIEVE IT IS IN SUDAN,  OR ETHIOPIA.
826729
its been millions of years
654393
The oldest megaliths in the world are located on the islands of Malta and Gozo. Archeologists have dated the stone structures of Ggantija (the Giant's Tower), Hagar Qim, Tarxien, and Mnajdra to about 5200 BCE. The first settlers arrived on Malta and Gozo around 5000 BCE from Sicily.\n\nRead more about it here:\nhttp://www.hmml.org/centers/malta/history.html
377738
Fossils such as ancient shell fish, dinosaur remains or trilobites are best found by looking at areas where long buried sediments are being exposed through erosion.  Outcroppings along river banks are one of the best places to look, as erosion is continuous.  Going out shortly after a rainstorm is usually the best time.\n\nFor arrow heads, those have only been around for at most 10 000 years or so, and most of the ones found are much younger than that.  The best place to find those is actually in farmers fields in regions that were once inhabited by native hunters.  When farmers till the soil, it brings up the debris and items buried in the dirt, including arrow heads.
680700
Carbonates is right. The best answer is A.\n\nRocks found in convergent boundaries probably won't stay around that long (in geologic years) because they can get subducted & melt. At divergent boundaries they are more likely to be new rock b/c of rifting in earth's crust. Ocean basins are a bad place to look for older rocks b/c of the last two statements.\n\nAnd yes the oldest rocks are found in Canada in what is termed the "Canadian Shield".\n\n:)
521108
The latest studies place the oldest rock formation in the canyon at 1.84 billion years old.  Note that you have to be somewhat careful when discussing the age of the rocks at the bottom of the Grand Canyon as the dates have become more refined with improved dating techniques while books and literature often quote older, outdated numbers that have since been revised.\n\nOne of the most recent published studies about the age of rocks in the Grand Canyon's inner gorge is that by geologist K. E. Karlstrom and others.  They identify the Elves Chasm pluton (a granite intrusion in the western end of the canyon) as the oldest rock formation in the canyon (and in the southwest US for that matter) at a date of 1.84 Ga (1.84 billion years old).  They also date most of the other rocks of the inner gorge (a variety of schists, gneisses and other granite plutons) over a range of 1.65 to 1.75 Ga (1.65 - 1.75 billion years old).\n\nThese dates place the oldest rocks of the inner gorge near the end of the geologic time frame known as the Paleoproterozic Era (which is the period from 1.6 to 2.5 billion years ago) when the North American continent was still forming and life was limited mostly to simple algaes.  \n\nNote that for many years, the inner gorge rocks were believed to be somewhat older (2 billion years or more) and were once even assigned to the earlier Archean period.  These somewhat older dates and classifications are still sometimes given in books, web pages, etc.\n\nLastly... I have the seen the Vishnu Schist complex that makes up much of the inner gorge added to the phrase mentioned above as 'Know The Canyon History, See Rocks Made By Time, Very Slowly' (Very Slowly = Vishnu Schist).
1001160
You can check out these sites on Sedna, a rock discovered 2 years ago