| 31. | "The earth's natural forces are awesome, but they are also predictable.
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| 32. | Marshall decided to use the natural force of the river to excavate and enlarge the tailrace.
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| 33. | As a result of these natural forces, the Steineberger Ley s bedrock is solid basalt.
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| 34. | His swirls and drips portray the rapid, random, and untamed effects of natural forces.
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| 35. | Puebloan tradition holds that the ancestors had achieved great spiritual power and control over natural forces.
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| 36. | They could be considered endangered because of the possibilities of erosion and other natural forces and vandalism.
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| 37. | Each surface has a polish and sheen that makes it seem untouched by human or natural forces.
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| 38. | When sediments are churned up by natural forces, the PCBs move over a much wider area.
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| 39. | Fourth-graders had to name a natural force that can alter the earth's surface.
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| 40. | Natural forces are invoked and imitated, and the viewer is artificially dwarfed by their seeming immensity.
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