which is the true and reliable theory of the earth's origin, considering the verios theories how old is earth?
456331
The problem with having a true and reliable answer is that new evidence will change it later on.  For now, the best answer is that it formed from a protosolar disc of dust.\n\nSee source for details.
530502
Ok, your question is very interesting and i think many people are thinking that you are jocking or crazy. Ok I will explain you some points:\n\n1.Fracis Crick, co-descovered ot the DNA structure says" The ADN structure could not have evolutioned in the earth in only 300 million of years, is very structured and developed to have been evolutioned in the eart in so short time."\n\n2.Probably the most certain theory about the origin of the life and the species in the earth is the Creation theory. This theory dont have contradictions and is very complete and let us explain everything about the origin of the life in the earth.\n\n3.There are a lot of evidence that the brain from the monk until the brain of the sinhantropus neede 15 million of years, but the brain with the homo sapiens appeared only 1 million of years after. This so Big Jump is impossible and the expert are not agree about what happened.\n\n4. The conlcutio is: We are aliens, because our DNA and our life is not from here, a Super Natural being created us, and this Being is our God. Now from the scriptures we can find many references about this Super Natural Being in the Bible and to him we should to feel respect because he has been with us from the fundation of the world.\n\n5.For this reason I think we are aleins and many reincarnation theories think that we have been in other lives in other planes and here is only one more that the planets where we can learn. For example, The asteroid belt, is considered by some clandestinity groups like a planet that was destroyed between the war between two races that are living in this planet today and they are having the same problems like there. Hopefully the eart will not finish like Traya de Maldek.\n\n6.Many conspiration theories says that the earth have a alien reaces from Z-Reticuli, and they are sharing technology with the American Goverment and it´s probably is a fact, but may be are rummors, the time will show us the true.\n\n7.And Like a Christian I think our Lord Jesus Christ is the most super natural being, our Master and opur Love, our example to Live and may be we will understand everything anbout this world because may be, like a old friend said me one day "The true is a Mirror Broken in thousand Pieces"
280906
Supposedly the universe is estimated to be about 13.6 billion years old.  I think I read that on Wikipedia, though, so you never know...\n\nThat said, I really have so little idea what is out there or what conditions are necessary for life to arise that I don't know which theory is more plausible.  How flexible are the conditions that lead to the formation of primative cells on Earth?  Can there be life based on an entirely different set of molecules?  An entirely different set of elements (i.e. not carbon based)?  How many other planets have chemical compositions and climates like Earth?  Did life even originate on Earth? (I've heard the theory that primative cells could have originated on another planet and been brought here on an asteroid).  Could primative cells have left Earth on some sort of asteroid and taken up residence elsewhere?\n\nI'd like to think there's other life out there, just because it makes things more interesting.  Until I have reason to believe otherwise, I'll assume there is.
1108935
Origins of life were initially suspcted to be of creation from God.\nThen the Theory of Evolution kicked in, suggesting all life came from a single cell.\nNow life came from a stone that banged into earth 4 billion years ago.\nBut are any of them true if we keep finding more truths. If breakthroughs always happen, wouldn't there be an endless amount of breakthroughs? So what we all know now is not the truth?\n\nThe origins of life on earth?\nDon't even think about it.
730967
The earth is BILLIONS of years old. That's 4500 Million years old , (about).\n\nPeople think know this because of four ways of thinking about it.\n\n1. We know about how old the sun is. \n\nThink of a soda with ice. when we start drinking theres plenty of soda and a the ice is frozen and the soda is cold, when the soda gets "older" it is more watery because the ice has all melted, when the soda gets really "old" the soda becomes flat and doesn't taste good. \n\nIt's kinda like that with the sun, we can see other stars, some that are young and some that are old and when we look at them all we can know the sun is about 4.5 billion years old based on how it behaves. \n\nStars are also a little bit like people in how they behave. Very young sun-like stars are bright and white or yellow and very active. Adolesent stars are not as active but are still bright and usually yellow or light orange in color. Middle age stars are orange and not quite as active. Old stars are darker colors of orange and even less active,and may start to get fatter and very old stars will grow bloated , turn redish and then become more dim and evenually end up becoming nurserys for other stars or planets after they die.\n\nWe think the earth formed at the same time as the sun, so that is about 4.5 billion years ago. \n\n2. Some elements on earth "decay" at a certain rate, think of it like a rusting tool in a shed or work area. One of the metals, Uranium decays over billions of years , almost all of the Uranium on the earth is of the same "decaying" age. That age is about 4.5 billion years ago. Oxygen and other elements have other "decay" rates and these also tend to support the fact that the earth has had oxygen in the atmosphere for about 3 billion years.\n\n3. We know the earth is old because of fossils , some fossils are of shells of sea animals that are very simple. Some of these shells are found on the highest mountains in the world. So if we say these shells were once deep in an ocean "how often do earthquakes move this mountains" and "how much does the mountain move up or down up each time", if we then say ok "we've been here watching this mountain for 200 years and there were two earthquakes and each earthquake  moved the mountain 1 inch. How long would it take to move 100 miles and 3 miles up. \n\nBy answering questions like that we can figure out how old certain mountains are, by doing this all over the earth the oldest mountains/rocks are in Australia and Canada and they are were formed a little less than 4 billion years ago.\n\n4. We think the moon formed from the earth being hit by another planet about the size of the planet mars, and we think that this happened about 4 to 3.5 billion years ago based on how far the moon is moving away from the earth and the incline of the earth and the moon.\n\nSome religions, notably the evangelical movement in the US, believe the earth was formed by God in 6 days. They figure based on the Bible backwards from when someone dies or was born backwards from Jesus , to King David, to Noah, to Adam and Eve and based on that math the Earth is only 6000 years old.  \n\nThis is not supported by any scientists as a good, reasonable date as the planet's surface is too large and would still be mostly molten rock if it was only 6000 years old and there would be no oceans or life just a big molten radioactive lava ball in space like a red hot bigger version of the moon...\n\nOther religions say that the earth was the result of a giant fight amongst the Gods and almost every society of man has what is called a "creation myth" which is how primitive people explain good questions when they don't _know_ or can't figure out the answers.
653288
James Hutton, the father of modern geology, started the foundations of this lovely principle. It was Charles Lyell, however, that got the ball rolling when he wrote about it in his book "The Principles of Geology". They woke up the world to geology. Gotta love those guys.\n\nThe principle of uniformitarianism (such a mouthful) simply states that all geologic processes that occur now occurred in the past & that they occurred at the same rates as they do today.\n\nThis is how Hutton figured the age of the earth. Most people of his time thought the earth was only about 6000 years old.\n\nLogically if these same geologic processes occur at the same rates then the earth should be much older than 6000 years.
1092532
according to mr. wikipedia... the age of earth is... geologists have determined the age of the Earth to be around 4.55 billion years (4.55x109 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 – 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.\n\n\nHope this helps... ^^
247560
It depend if you are a religions person or believe in facts. Me, as a geologist I believe in facts and science.\nThe earth forms 4.6 billions years ago. How did we know? By using the radioactive decay method. \nNobody really knows how it form but you can get differrent references. Try historical geology books. \nEarth solidifies around 3 billion years ago, how? From the dated rocks namely Banded Iron Deposits. Life began at PreCambrain era. Meaning 512 millions years ago. Dinosaurs came to life at least 100 million years ago and died 65 miilion years ago because of  a comet hitting the earth.\nActually there are a lot more happend but for your satisfaction try to look for a Historical geology book. A very interesting book.
427234
The Book of Genesis deals with the fact that God created the earth. It was written in a manner that could be understood by primitive wandering cultures. Now we can say that the Bible is wrong about creation or that science does not have it right as far as creation is concerned. I don't agree with either point. I believe the best way to look at this is God created everything. How God did this, is still a mystery to we humans that are His  one of His creations.\n\nEvolution is a theory that is still listed as unproven. This means that Evolution is our best guess at this time with the evidence we now have of how our world and the life within it came into being and now exists. It does not mean that it is the way it happened. As with the Bible we have to live in faith.
1033409
There are none! Cause the world hasnt even been here that long! This world has only been here lyk ovr 2000 years! Im assuming u eithr believe n evolution or ur jst stupid lol! Cuz seriously y would u think the earth has been here that long! Im not a big god person but sitll god created the world n if it was here 4 more then 180 million years i think he would tell us that! Jst trust me ppl who think our world is that old r jst crazy! Cuz it aint true! Cuz if it was y is our year 2006? Y wouldnt it b 180,000,000!!! Honestly if the world was here that long the year would b that high! N if u dnt believe me then ur crazy cuz ppl who think the earth is that old r jst crazy!
496038
543 million  years ago (Evolutionary Analysis 2nd Ed, by Freeman & Herron).\n\n544 million years ago\nhttp://geology.er.usgs.gov/paleo/glossary.shtml#p\n\n570 million years ago\nhttp://www.palaeos.com/Geochronology/gcglossary.html\n\n600 million years ago\nhttp://www.scienceclarified.com/Ga-He/Geologic-Time.html\n\n(Absolute dating is not exact. See the last link)
750286
Scientists say that the Earth is about 4.5 billion years old. The oldest rocks that have been found are 3.8-3.9 billion years old. They actually think the Earth is 4.55 billion years old to be specific. Just to let you know i got it off  a website.
54811
According to the US Geological Survey (USGS), the Earth is approximately 4.5 billion years old.\n\nThe articles below discuss the evidence for this estimate.
1037575
The Earth is about 12,750 kilometers (km) in diameter.\n\nHere are some answers to some more of your questions:\n\nHow old is the earth?\nThe earth is about 4.5 billion years old. That is 45,000,000,000 years. The sun, the moon, the planets, and nearly everything in our solar system was formed at the same time, so they are all 4.5 billion years old. \nHow does the earth spin?\nIf you look around at planets, stars, and galaxies in the universe you will see that EVERYTHING spins! This is because planets like Earth (and stars and galaxies) formed from a large cloud of gas and dust. As gravity pulled the cloud together, any little bit of spin gets multiplied. This is known to scientists as the Conservation of Angular Momentum. You can try this out yourself. Find a chair that spins easily and sit on it. Start out by spinning with your arms outstretched, then pull them in to your body. Did you notice that the chair started to spin faster when you pulled your arms in? The same thing happens as the planet forms — as its gas, dust, and rocks fall together the planet spins up faster and faster. Later other things can affect the spin. Earth and the moon pull on each other, affecting both their spins and the orbit of the moon. It's quite a dance! \n\nHow fast is the earth spinning and why can't we feel it spin?\nThe circumference of (distance around) the earth is 2 x PI x radius, which turns out to be about 24,000 miles. Since the earth turns once per day (or 24 hours), that is 1,000 miles per hour! We don't feel that because everything else is moving with us and because the motion is very, very smooth. It's kind of like sitting in a car and reading a book or playing a game. If the car is going very smoothly, with no stops or bumps, and you don't look out the window, you wouldn't know you were moving. The only reason we know the earth is turning is because the sun and stars move across the sky. \n\nWhat is the exact tilt of the earth? How much does it change throughout the year?\nThe tilt of the earth is 23.45 degrees. This is measured as the tilt of the earth's equator compared to its orbit around the sun. The amount of the tilt doesn't change with time, but the direction that the earth's poles are pointed does. This is called precession. It is just like the wobbling of a spinning top. The direction that the North Pole (and South Pole) is pointed moves in a circle in the sky very slowly, completing each circle once every 26,000 years. \n\nWhy does only Earth have so much oxygen?\nThat's a very good question — no other planet in the solar system has so much oxygen. The answer is — life! Earth did not originally have a lot of free oxygen in the atmosphere. The oxygen was mostly combined with other elements to make carbon dioxide, water, or in rocks. But as early life evolved, especially plants, well they give off oxygen. So the reason we have so much oxygen in our atmosphere — and we are here and can breathe it! — is due to plant life on the earth! \n\nHow can rockets get through the earth's atmosphere, but comets can't?\nObjects hitting our atmosphere usually burn up because they are hitting it so fast. Usually they are moving at hundreds or thousands of miles per second. Rockets and the shuttle move more slowly (although pretty fast compared to cars on the highway). Here's a comparison. If you jump into a swimming pool from the high board and hit the water really hard, it stings and you make a big splash. But if you step into the water slowly, it feels fine and you make only a little ripple. The same thing happens to meteors — they hit the earth's atmosphere real hard and go splat! \n\nIf a comet hit the earth, what would happen?\nIt could cause a big explosion. The nucleus of a comet is thought to be a mile or two in size. The nucleus is made up of ice and rock, but we aren't sure how solid it is. Something that big hitting the earth from space would be bigger than
1173619
This answer was the most funny:\n\n"The whole Bible is the truth. Science is not always right you know. Ancient scientist once believed that the earth was flat! I think we have come a long way! :) "\n\nSo according to her, progress is going back to stone age thinking.\n\nSkygod make world in 7 day. Me made of dirt. You made of me rib. Whoowhooo. Me want banana.
277533
I believe in the Bible.\nThe Bible says that the world was created in six literal 24 hour days, is around 6000 years old, that man and dinosaurs lived together (being created in the same week), and that there was a flood that totally covered the entire planet, killing off the vast majority of human, plant and animal life on the planet.\nThe amount of scintific evidence that supports this theory is simply staggering, but rarely given a chance to be heard or seen due to the wide-spread acceptance of the evolution theory.\n\nDid you know that the earth's rotation is slowing down? So if you back up in time a few million years, you have to speed the earth's rotation up proportionatly - you can't even go back a few million before the earths rotation becomes so fast that life on this planet is not possible anymore. - Much less 4.6 billion years.\n\nThe orbit of the moon is growing a little bit farther away from the earth every year, so if you back that one up a few million years, the moon would have been so close to the earth that the tide would have come so high it would wipe out all life on the  planet twice a day. - 4.6 billion years ago, it would have to have been touching the earth,  not oribiting the earth.\n\nI could go on for many pages like this, but follow the link below to find out more about that the Bible says about creation, and what scientific examination of these claims have shown.
1167352
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.