The New Encyclopaedia Britannica: Macropaedia: knowledge in depth. 19 vEncyclopaedia Britannica, Incorporated, 1981 - Encyclopedias and dictionaries |
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Page 168
... Rock polish , striations , grooves , and friction cracks . Pure ice at its pressure - melting point has little abrasive ability on hard rock , yet many granite outcrops are high- ly polished as the result of the passage of glacier ice ...
... Rock polish , striations , grooves , and friction cracks . Pure ice at its pressure - melting point has little abrasive ability on hard rock , yet many granite outcrops are high- ly polished as the result of the passage of glacier ice ...
Page 170
... rocks were more susceptible to glacial erosion than those in which no basins occur . There is reason to believe that both explanations ac- count for the alternating rock steps and rock basins that characterize the longitudinal profile ...
... rocks were more susceptible to glacial erosion than those in which no basins occur . There is reason to believe that both explanations ac- count for the alternating rock steps and rock basins that characterize the longitudinal profile ...
Page 879
... rock , 43 ° to 48 ° . The steepness of these straight threshold slopes depends not only on the type of rock mass but also on the rate of undercutting of the rock mass in relation to the rate of weakening of it . 4. Under conditions of ...
... rock , 43 ° to 48 ° . The steepness of these straight threshold slopes depends not only on the type of rock mass but also on the rate of undercutting of the rock mass in relation to the rate of weakening of it . 4. Under conditions of ...
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