the spontaneous emission of X-rays or gamma rays by an atom O heat generated as

Question

the spontaneous emission of X-rays or gamma rays by an atom O heat generated as uranium decays into lead O the absorption of subatomic particles by an atomic nucleus. UESTION 26 As geologists study older and older rocks, the data base is less and less complete. This is O Most geological investigations are driven by economic concerns like ore production or h have not been studied O The oldest rocks are so deeply buried by younger sediments that they are not easily acc O many of the oldest rocks on Earth have been recycled or at least metamorphosed so mu UESTION 27 Lord Kelvin a Scotish mathematician and physicist, estimated the age of the Earth to be abo e Search the web and Windows

Explanation / Answer

Answer - many of the oldest rocks on earth have been recycled or atleast metamorphosed so much that their initial characteristics are lost

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