when does dating turn into a relationship - What is relative dating in terms of fossils
are deposited in a time sequence, with the oldest on the bottom and the youngest on the top." This is just as newspapers found in accumulated trash tends to be older on the bottom than they are on the top.
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Sedimentary rocks form from soil and silt carried and deposited by moving water.
Over time, the accumulated deposits compress and harden.
Another way to date an ash-surrounded rock layer is by identifying the geologic era of the fossils it carries.