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Answer:

The layer of iridium is used to tell the relative age of different because the iridum was deposited worldwide and the comparison can be made world wide.

We have that for the Question "How is the layer of iridium used to tell the relative age of different rock strata and fossils" it can be said that rock strata and fossils can have there ages detected by following the layer of irudium over the newer ones recently dropped

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How is the layer of iridium used to tell the relative age of different rock strata and fossils

Generally

  • it is important to note that iridium is an element that has had its deep root on earth for the longest of times
  • Because of this unending  deposition of iridium all over the earth
  • There is a particle of iridium on most rock strata and fossils allover the earth
  • Now rock strata and fossils can have there ages detected by following the layer of irudium over the newer ones recently dropped

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