Coal and petroleum / crude oil are very important non-
renewable energy resources that will one day run out.
ONTA is a geology company that makes different kinds
of educational coal and petroleum / crude oil sample sets.
These sets show how coal and crude oil are made in and come from
the earth and how they are similar to and different from each other.
These sets can be seen by pressing any of the 16 different
numbered page links located on the left hand side column.
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