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A fossil is the remains or impression of a prehistoric organism preserved in a mold or cast of a rock.
With the help of data distribution of fossils and rock strata, continental shapes and seafloor structures, the theory of a supercontinent such as Pangea is quite likely.
In one of the labs we imprinted a shell into playdough. This would be called a mold fossil.
As well in this lab we excavated fossils from a rock of plaster.
Excavate means to remove the ground of the earth carefully to pull out fossil remains.