you cannot get away from me I have almost as much mass present in the earth's crust as all the other elements put together
Answers
Answer:One might think we know a lot about the Earth’s evolution from an accretion disk to a planet fledgling with life. That is completely untrue. I have talked about this elsewhere. Suppose you take Earth and reduce each 100 million years of its life into 1 year. Then Earth will be a nice 46 years old with a few gray hairs, a pot belly and mid-age balding. We live on this ball but have very little actual evidence about the first 20 years of its life; only a few speculations and conjectures. The next 21 years we know a bit more, mostly geology but again based on rocks obtained indirectly. Still no magic of life existed and we do not know why. Life has only come around the last 5 years on this 46-year old Earth and changed only a small thickness of the crust. Dinosaurs were ruling it till 6 month ago and human beings (modern homosapiens) were born 17 hours ago. If we do not mature fast and keep to our infantile habits we probably will not make it and go extinct before we are even one day old.
Here is an artist’s impression of the Earth and its layers below our feet.
Unfortunately the above structure is all mostly an artistic impression. Very little exists in the way of actual scientific data. One might think the vibration sensing and Earthquake tracking equipment have completely scanned and verified the constitution of Earth. That is not correct. Note that for oil drilling, a lot of such testing is done. Still, if drilling is done purely on the basis of geological evidence and vibration testing (called wildcatting in oil drilling lingo), the chance of hitting oil is between 1 in 10 and 1 in 25. And keep in mind oil wells only go 2 to 6 kilometers below ground. That means the vibration testing even at 10% of crust is at best only 10% accurate in identifying what is below.
One might think we have a treasure trove of rocks that tell us about the composition and history of Earth. I let you be the judge of that. The simplest thing would be to look at radionuclide concentrations in rocks and estimate from the decay constants the age of the rock; kind of like carbon dating the rock but on a much longer timescale. In reality, one has to be very selective in choosing the data and ignore a large number of samples to even be able to present numbers physicists and astronomers will not laugh at. Here is a sample of analysis of rock samples taken from Black Hill south dakota mines.
Explanation:
Hey mate Oxygen is the correct answer because Oxygen, O2, is by far the most abundant element in earth's crust at 46.6 percent, nearly half of the mass of the crust.
Oxygen is a highly reactive element capable of combining with many other elements to form compounds. It readily combines with silicon (Si) to form silicate minerals or with iron (Fe) to form various iron ore compounds.