Recycling the Earth's CrustOlder rocks are destroyed by weathering processes and the remains are . Weathering and erosion at the earth's surface can break down rocks into small bits. .. Of course, along the way these major rivers still gain additional sediment and.small rock major,Rock/Mineral/Fossil Identification - Ohio Geological SurveyGet your Ohio-found rock identified by the Ohio Geological Survey. Have an unusual rock, mineral, or fossil sample? Let our . Major Topics › Rock Identification.
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