Page 18 - Uncle Darwin, We Haven't Changed

emains of plants, animals and some-
times human beings, preserved in the
earth’s crust from ancient times, are
called fossils. Every living creature that dies does not
become a fossil. In order for fossilization to happen,
the dead body must be suddenly cut off from the air.

For example, they must be covered by earth, mud or
some other such thing. This might be caused by the
eruption of a volcano during which lava or heavy ash
covers the area. It is in this way that the structure
of ancient living things has been preserved to the
present time. Fossils can be found everywhere
in the world and they are the most
important source for our

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