The Law of Superposition states that the oldest layer is at the bottom and the youngest at the top. Therefor, what is new builds upon what is preexisting.
Fossils aren't but the life that made them is.
Changes in climate
how different parts of earths history compare to the whole world
fossil record geologic time scale
hi
superposition a&c- Jackie
However, volcanoes are essential to earths survival they act like a safety valve for the planet (it releases pressure)
What are two ways that's scientists can study earths climates history
epoch
In sedimentary rock.
Historical geology.
precambrian era
to die
because
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