SHALE Shale is a clastic sedimentary rock composed of silts, clays or muds that have been compacted into distinct layers. Shales may be easily split along these layers. Shale is a very common sedimentary rock, and often preserves fossils and sometimes even fossil tracks. |
See Steve's video interview about asteroid capture at Moonandback: Part 1 Part 2 Part 3 |
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See Steve's blog Ramblings On The Future Of Humanity (recent post) A Project Plan for Space Based Solar Power
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