Earth Sculpture; Or, The Origin of Land-forms |
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Page 16
... the processes by which rocks become so highly altered are still more or less obscure , yet there can be no doubt that the metamorphism had taken place when the rocks affected were more or less deeply 16 EARTH SCULPTURE.
... the processes by which rocks become so highly altered are still more or less obscure , yet there can be no doubt that the metamorphism had taken place when the rocks affected were more or less deeply 16 EARTH SCULPTURE.
Page 18
... become of them , we must observe what is taking place under the influence of existing agents of change . How , then ... becoming disintegrated . In one place they are breaking up into angular fragments ; in another , crumbling down into ...
... become of them , we must observe what is taking place under the influence of existing agents of change . How , then ... becoming disintegrated . In one place they are breaking up into angular fragments ; in another , crumbling down into ...
Page 27
James Geikie. are becoming rotten and disintegrated . In limestone areas it can be shown that sometimes hundreds of feet of rock have thus been gradually and silently re- moved from the surface of the land . And the great depth now and ...
James Geikie. are becoming rotten and disintegrated . In limestone areas it can be shown that sometimes hundreds of feet of rock have thus been gradually and silently re- moved from the surface of the land . And the great depth now and ...
Page 28
... become that frost is unable to get at the living rock . The loose fragments , how- ever , under which it lies concealed , are themselves shattered , crumbled , and pulverised , until they are in a condition to be swept away by wind or ...
... become that frost is unable to get at the living rock . The loose fragments , how- ever , under which it lies concealed , are themselves shattered , crumbled , and pulverised , until they are in a condition to be swept away by wind or ...
Page 33
... becomes intensified — fine mud , silt , sand , and grit are swept into the brooks and streams , and the swollen ... become more or less saturated by melting snow . Το such a degree is this soaking sometimes carried , that the whole ...
... becomes intensified — fine mud , silt , sand , and grit are swept into the brooks and streams , and the swollen ... become more or less saturated by melting snow . Το such a degree is this soaking sometimes carried , that the whole ...
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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