Earth Sculpture; Or, The Origin of Land-forms |
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Page 2
... nature's forces . But with increased knowledge these views gradu- ally became modified . Eventually , it was recognised that no hard - and - fast line separates past and present . The belief in world - wide , or nearly world EARTH ...
... nature's forces . But with increased knowledge these views gradu- ally became modified . Eventually , it was recognised that no hard - and - fast line separates past and present . The belief in world - wide , or nearly world EARTH ...
Page 22
... natural division - planes or joints which cut across the strata in directions more or less perpendicular to the bedding . More irregular usually are the joints which intersect hard slates and quartz- rock , these being divided generally ...
... natural division - planes or joints which cut across the strata in directions more or less perpendicular to the bedding . More irregular usually are the joints which intersect hard slates and quartz- rock , these being divided generally ...
Page 26
... nature of the rock and the length of time its surface has been exposed , may vary from less than an inch up to many feet , or even yards , in thickness . Some granites , for example , are reduced to a kind of gritty clay which may be ...
... nature of the rock and the length of time its surface has been exposed , may vary from less than an inch up to many feet , or even yards , in thickness . Some granites , for example , are reduced to a kind of gritty clay which may be ...
Page 29
... natural division - planes of rocks and wedge these asunder ; and thus , by allow- ing freer percolation of water , they prepare the way for more rapid disintegration . Nor can we neglect the action of tunnelling and burrowing animals ...
... natural division - planes of rocks and wedge these asunder ; and thus , by allow- ing freer percolation of water , they prepare the way for more rapid disintegration . Nor can we neglect the action of tunnelling and burrowing animals ...
Page 31
... natural springs . All these springs contain mineral matter , derived from the chemical decomposition and solution of rock - constituents . Many , indeed , are so highly impregnated , that as soon as they are exposed to evaporation they ...
... natural springs . All these springs contain mineral matter , derived from the chemical decomposition and solution of rock - constituents . Many , indeed , are so highly impregnated , that as soon as they are exposed to evaporation they ...
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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