How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading? They show when Earth's poles reversed.
They show how the density of the seafloor has changed.
They reveal a matching pattern on either side of the ridge.
They reveal differences in the mineral composition of newly created rock.

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answer: c. relative dating

relative dating uses the location and depth of where fossil is found in order to estimate it's age. it gives an idea about the order of past events. it does not give the absolute age but can give approximation. it just gives an indication about one fossil is older than other.