geologist hand holds raw specimen gray shale clastic sedimentary rock nature background |
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| navigate by keyword : accounting background black carbon charcoal clastic close closeup coal common crust crystal earths food fossil found fuel geologists geology gray hand holds isolated macro mineral most natural nature object ore percent piece power raw rock rough sedimentary shale specimen stone texture white |
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| Shale is the most common sedimentary rock, accounting for about 70 percent of the rock found in the Earth`s crust. |
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