The Student's Handbook of Physical GeologyG. Bell, 1892 - 666 pages |
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Page 26
... extends down into the foundation rocks . " Another group of ejected blocks con- sists of coarsely crystalline varieties of the lava that usually issues from the volcano , and these are no doubt portions of the magma that have cooled as ...
... extends down into the foundation rocks . " Another group of ejected blocks con- sists of coarsely crystalline varieties of the lava that usually issues from the volcano , and these are no doubt portions of the magma that have cooled as ...
Page 32
... extending for long distances , and cutting through all the rocks of which the country is composed . Such dykes are sometimes found extending for distances of 50 or 100 miles across the country ; and in Iceland , during the eruption of ...
... extending for long distances , and cutting through all the rocks of which the country is composed . Such dykes are sometimes found extending for distances of 50 or 100 miles across the country ; and in Iceland , during the eruption of ...
Page 38
... extend four or five miles along the coast , consist of horizontal beds of volcanic tuff , traversed in every direc- tion by dykes and veins of lava . Etna . This volcanic cone rises majestically to the height of more than two miles ...
... extend four or five miles along the coast , consist of horizontal beds of volcanic tuff , traversed in every direc- tion by dykes and veins of lava . Etna . This volcanic cone rises majestically to the height of more than two miles ...
Page 39
... extending from Cavanno on this side to Monte Fenoccio on the other , and have settled itself into a smooth and lake - like surface , over which the winds have spread a coating of the finest dust . " At the further end of this plain are ...
... extending from Cavanno on this side to Monte Fenoccio on the other , and have settled itself into a smooth and lake - like surface , over which the winds have spread a coating of the finest dust . " At the further end of this plain are ...
Page 46
... extends for a mile to the south of the island . The soundings show that it is separated from Namuka Island by a valley 6,000 feet deep . Metis Island , 73 miles N.N.E. of Falcon Island , is another volcanic cone that appeared a few ...
... extends for a mile to the south of the island . The soundings show that it is separated from Namuka Island by a valley 6,000 feet deep . Metis Island , 73 miles N.N.E. of Falcon Island , is another volcanic cone that appeared a few ...
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Common terms and phrases
acid action agencies altered alumina amount anticlinal augite basalt beds blocks bottom calcareous calcite called carbonate of lime carbonic acid chalk channel chemical clay cleavage cliffs coast colour consists coral cracks crystalline crystals currents débris denudation deposits depth described detrition distance district dolerite dykes earth earth's crust Edited elevation erosion eruptions fault feet felspar fissures formation formed fragments Geol Geology glacier glauconite gneiss gradually granite greensand ground hills horizontal hornblende igneous rocks iron island Jukes lakes land lava layers limestone magnesia mass material metamorphic mica miles mineral mountain occur original Orthoclase outcrop oxide particles pebbles planes porphyritic portion pressure produced quartz rain reefs ridge rise river sand sandstone schist shale shells shore side siliceous slope soil solution sometimes stones strata stratified rocks stream structure surface thickness tion tract Translated unconformity valley vertical volcanic