| 1. | Aquitards comprise layers of either clay or non-porous rock with low hydraulic conductivity.
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| 2. | Chalk is a porous rock, so the chalk hills have little surface water.
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| 3. | It would be micro-organisms that retreated into porous rocks themselves.
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| 4. | :Oil doesn't sit in voids in the earth, it is usually in porous rocks.
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| 5. | Similarly, coral, petrified wood and other organic remains or porous rocks can also become agatized.
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| 6. | They were built along the spring line, where the underlying aquifers met less porous rocks.
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| 7. | The vast majority of geothermal energy within drilling reach is in dry and non-porous rock.
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| 8. | In theory, almost all porous rocks contain water.
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| 9. | These hydrocarbon deposits, collected in porous rocks trapped beneath impermeable cap rocks, comprise commercial oil fields.
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| 10. | The porous rock meant that there was a need to repeatedly build support columns, slowing progress.
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