Earth Sculpture; Or, The Origin of Land-forms |
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Page 13
... yields . by bending and folding , by fracture and displacement . Obviously , then , the mysterious subterranean forces . must have played an important part in the formation of earth - features . Disturbed rocks are of more fre- quent ...
... yields . by bending and folding , by fracture and displacement . Obviously , then , the mysterious subterranean forces . must have played an important part in the formation of earth - features . Disturbed rocks are of more fre- quent ...
Page 19
... yielding rapidly , others being more resistant . We need not go into detail . Their composition and structure may be de- scribed in the most general terms . For our purpose it will suffice to group them roughly under these four heads ...
... yielding rapidly , others being more resistant . We need not go into detail . Their composition and structure may be de- scribed in the most general terms . For our purpose it will suffice to group them roughly under these four heads ...
Page 23
... yield unequally to strain or tension . This is particularly the case with many crys- talline felspathic rocks , such as coarse - grained granite , gneiss , and mica - schist - built up , as these are , of min- erals that differ in ...
... yield unequally to strain or tension . This is particularly the case with many crys- talline felspathic rocks , such as coarse - grained granite , gneiss , and mica - schist - built up , as these are , of min- erals that differ in ...
Page 26
... yield more or less read- ily to the solvent action of the water . All calcareous rocks , in short , tend to fall an easy prey . If they contain few or no impurities , they " weather " with little or no crust ; the rock is simply ...
... yield more or less read- ily to the solvent action of the water . All calcareous rocks , in short , tend to fall an easy prey . If they contain few or no impurities , they " weather " with little or no crust ; the rock is simply ...
Page 37
... yield very different results . But even in the case of the least active streams the transported material is much more considerable than might have been sup- posed . Hence one need not wonder that in spite of obstacles the deltas of many ...
... yield very different results . But even in the case of the least active streams the transported material is much more considerable than might have been sup- posed . Hence one need not wonder that in spite of obstacles the deltas of many ...
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Common terms and phrases
accumulation Alps anticlines basalt base-level basins become beds Carboniferous character cliffs coast-lines cones configuration Cretaceous crust crustal movements crystalline débris denudation deposits depressions depth detritus direction dislocations drainage elevation epigene action epigene agents eroded escarpments eventually feet fiords flexures flow fluvio-glacial deposits folds fracture gently geological structure glacial action glaciers gradually granite ground-moraines Highlands hills hollows horizontal strata ice-sheet igneous rocks inclined indented infrequently irregular islands joints Jura Mountains laccoliths lakes land land-forms land-surface lava less limestone low grounds masses materials Mesozoic modified moraines mountain-chain mountain-valleys mountains normal faults North Old Red Sandstone outcrops owe their origin Permian plain of erosion plateau regions relatively result ridges rock-basins rock-masses sand sandstones schistose schists Section sediment shales Silurian slopes Southern Uplands strata streams and rivers superficial surface surface-features synclinal tectonic tend thickness tion tracts traversed underground undulating usually valleys vertical volcanic