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

Answer and Explanation:deposition has been occurring on earth for a very long time. as time goes by, more deposits form layers on the earth, including the remains of animals and plants that would later become fossils, burying the previous deposits in another layer of newer deposits. therefore it follows that layers which are found deeper are older than those found in layers near the surface

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answer; /// i do believe that the correct answer is (a) boiling