| 11. | Authorities carried out 1, 200 controlled blasts to dig through the tough rock structure.
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| 12. | The rock structure was created during the Alpine orogeny and exposed by subsequent erosion.
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| 13. | The preglacial drainage pattern was controlled by the rock structure.
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| 14. | He was first attracted by the general rock structure of the Rouyn area in 1911.
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| 15. | It was listed in a group with many other lava rock structures in Lincoln counties.
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| 16. | A knowledge of the underlying rock structure helps to predict the location of mineral deposits.
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| 17. | A driver was washing his carriage on the point when the rock structure gave way.
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| 18. | Few men have equalled him in the truthful rendering of rock structure and mountain form.
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| 19. | Soft ground or mixed tunneling was used where there was insufficient rock structure for underground support.
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| 20. | After the small building was rebuilt, the rock structure was used almost entirely as a church.
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