Many scientists have contributed and continue to contribute to the refinement of the geologic time scale as they study the fossils and the rocks, and the chemical and physical properties of the materials of which Earth is made.
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have contributed study is made continue continue to contribute
the fossils and the rocks
to contribute to the refinement of the geologic time scale as they study the fossils and the rocks, and the chemical and physical properties of the materials of which
to the refinement of the geologic time scale the chemical and physical properties of the materials of which