| 11. | When erosion removes the overlying rock material, these intrusive rocks are exposed and the pressure on them is released.
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| 12. | Approximately 30 million years ago, a large caldera was formed when overlying rock collapsed into an underground lava chamber.
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| 13. | Over time, most of the overlying rock was uplifted along with the rest of the exfoliation and mass wasting.
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| 14. | Rock units are first emplaced either by sills, push upwards into the overlying rock, and crystallize as they intrude.
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| 15. | The leaching of minerals from pumice gravel, soils, and overlying rock provides for deposition of secondary speleothems in lava tubes.
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| 16. | Hydrothermal alteration may be driven by the formation of a deep magma reservoir and resulting hydrothermal circulation in overlying rocks.
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| 17. | Artesian mound springs form when water from the Great Artesian Basin reaches the surface through cracks in the overlying rock.
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| 18. | It is estimated that the maximum depth of a cave cannot be more than due to the pressure of overlying rocks.
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| 19. | Over time, these concretions weathered from what was overlying rock, and then became concentrated on the surface as a lag deposit.
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| 20. | It was constructed using the room and pillar technique, where pillars of dolostone have been left to support the overlying rock.
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