how old is the earth?

Answer 1

4.5 billion years. If you believe the big bang. Religious thinkers think its more of 100,000-200,000 years.

Answer 2

Sir:

Scientists estimate the age of the Earth at about 4 Billion Years old.

Answer 3

The generally accepted age for the Earth and the rest of the solar system is about 4.55 billion years (plus or minus about 1%). This value is derived from several different lines of evidence.

Unfortunately, the age cannot be computed directly from material that is solely from the Earth. There is evidence that energy from the Earth's accumulation caused the surface to be molten. Further, the processes of erosion and crustal recycling have apparently destroyed all of the earliest surface.

The oldest rocks which have been found so far (on the Earth) date to about 3.8 to 3.9 billion years ago (by several radiometric dating methods). Some of these rocks are sedimentary, and include minerals which are themselves as old as 4.1 to 4.2 billion years. Rocks of this age are relatively rare, however rocks that are at least 3.5 billion years in age have been found on North America, Greenland, Australia, Africa, and Asia.

While these values do not compute an age for the Earth, they do establish a lower limit (the Earth must be at least as old as any formation on it). This lower limit is at least concordant with the independently derived figure of 4.55 billion years for the Earth's actual age.

The most direct means for calculating the Earth's age is a Pb/Pb isochron age, derived from samples of the Earth and meteorites. This involves measurement of three isotopes of lead (Pb-206, Pb-207, and either Pb-208 or Pb-204). A plot is constructed of Pb-206/Pb-204 versus Pb-207/Pb-204.

If the solar system formed from a common pool of matter, which was uniformly distributed in terms of Pb isotope ratios, then the initial plots for all objects from that pool of matter would fall on a single point.

Over time, the amounts of Pb-206 and Pb-207 will change in some samples, as these isotopes are decay end-products of uranium decay (U-238 decays to Pb-206, and U-235 decays to Pb-207). This causes the data points to separate from each other. The higher the uranium-to-lead ratio of a rock, the more the Pb-206/Pb-204 and Pb-207/Pb-204 values will change with time.

Answer 4

And the debate goe's on!..If your an American, you will no doubt be verbally assaulted by "creationists"who will try to tell you that the Earth and the whole Universe is only 6,000 years old!..They HAVE NOT produced one bit of evidence that stands up to even cursory scientific examination!..Its all rubbish, and probably God insulting blasphemy into the bargain!..The Earth is about 4.6 billion years old, dating of the earliest rocks found in Western Australia confirm this!..The first discernable microbial life forms appeared about 4.3 billion years ago!..The first land dwelling creatures about 1.5 billion years ago, and their descendants all later went into politics!..{Whoops!...Sorry!}..Hope this gives you something to go by!

Answer 5

between 4 and 5 billion years.

Answer 6

4 or 5 billion years.

Answer 7

well scientists that study that . have found that in that long tubes of dirt that they get the most certain years that earth have is 4.6 billion years (though is young compared to sun)

Answer 8

this number : 4 billion years, is the key to your inquiry, the consensus among those who have tested the basaltic
lavas of our distant past....

Answer 9

4,482,100,623 years. But who's counting?