Earth Sculpture; Or, The Origin of Land-forms |
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Page 31
... rivers reach the sea , help us to appreciate the amount of rock - material which underground water is capable of removing . When we add to this all the mineral matter leached out at the surface and carried away by streams and rivers ...
... rivers reach the sea , help us to appreciate the amount of rock - material which underground water is capable of removing . When we add to this all the mineral matter leached out at the surface and carried away by streams and rivers ...
Page 33
... streams , and the swollen rivers run discoloured to the sea . Similar floods often result from the melting of snow in spring . During such floods our rivers are generally more turbid than when they are swollen merely by heavy or ...
... streams , and the swollen rivers run discoloured to the sea . Similar floods often result from the melting of snow in spring . During such floods our rivers are generally more turbid than when they are swollen merely by heavy or ...
Page 35
... river and its feeders . In temperate and northern latitudes natural springs and frost are responsible for much of the rock débris which cumbers the beds of streams , but much also is dis- lodged by the undermining action of the water ...
... river and its feeders . In temperate and northern latitudes natural springs and frost are responsible for much of the rock débris which cumbers the beds of streams , but much also is dis- lodged by the undermining action of the water ...
Page 37
... river . As might have been expected , the amount varies with the season of the year in each individual river , while different rivers . yield very different results . But even in the case of the least active streams the transported ...
... river . As might have been expected , the amount varies with the season of the year in each individual river , while different rivers . yield very different results . But even in the case of the least active streams the transported ...
Page 39
... streams and rivers . Indeed , we may say that it is in valleys generally that we may expect to find the most cogent evidence of erosion now in action . A little consideration will show that the estimates just referred to do not tell us ...
... streams and rivers . Indeed , we may say that it is in valleys generally that we may expect to find the most cogent evidence of erosion now in action . A little consideration will show that the estimates just referred to do not tell us ...
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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