| 1. | Solid rock surfaces, such as outcroppings, have high thermal conductivities and inertias.
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| 2. | Where the till blanket is absent the bare rock surfaces are exposed.
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| 3. | Axes and chisels cut away the rock surface for the pendulum's base.
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| 4. | Now the rock surface is slowly flaking away as water seeps in.
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| 5. | The acoustic quality is created by the rough, virtually unworked rock surfaces.
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| 6. | Ore is first crushed by hand on open rock surface and hammerstones.
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| 7. | On the surface block size is measured by observing exposed rock surface.
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| 8. | Previous drill bits would be ground down when they hit hard rock surfaces.
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| 9. | The age of exposure of a rock surface is then extrapolated from records.
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| 10. | Water glyphs, however, typically lie along horizontal cliff edges or exposed rock surfaces.
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