The Student's Handbook of Physical GeologyG. Bell and Sons, 1884 - 514 pages |
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Page ix
... V. - TERRESTRIAL AGENCIES Rain , its chemical action , and mechanical effects . Action of Wind . Action of Heat and Cold . Action of Frost . General Results . PAGE . 1 20 37 49 65 CHAPTER VI . - UNDERGROUND CIRCULATION OF WATER . Causes.
... V. - TERRESTRIAL AGENCIES Rain , its chemical action , and mechanical effects . Action of Wind . Action of Heat and Cold . Action of Frost . General Results . PAGE . 1 20 37 49 65 CHAPTER VI . - UNDERGROUND CIRCULATION OF WATER . Causes.
Page 23
... rain . 2. A discharge of dust , ashes , and stones . 3. The ejection of larger blocks with heavier explosions : at the same time the red glow of the lava rising in the funnel lights up the vapour - clouds above , and produces the ...
... rain . 2. A discharge of dust , ashes , and stones . 3. The ejection of larger blocks with heavier explosions : at the same time the red glow of the lava rising in the funnel lights up the vapour - clouds above , and produces the ...
Page 24
... rain , thunder - storms are frequent , and great floods are thereby occasioned . The rain - water courses down the slopes and sweeps along the loose volcanic dust and ash , forming muddy torrents , which often work more damage and ...
... rain , thunder - storms are frequent , and great floods are thereby occasioned . The rain - water courses down the slopes and sweeps along the loose volcanic dust and ash , forming muddy torrents , which often work more damage and ...
Page 26
... rain , which is constantly falling during a long - con- tinued eruption , mingles with the fine volcanic dust , and produces a peculiar pasty kind of mud , which sets into a firm , but light and porous stone , and is known by the name ...
... rain , which is constantly falling during a long - con- tinued eruption , mingles with the fine volcanic dust , and produces a peculiar pasty kind of mud , which sets into a firm , but light and porous stone , and is known by the name ...
Page 32
... rain and frost better than the less coherent tuffs around them . The floor of the great hollow forms a desolate plain . Innumerable currents of lava have flowed into it , and some have advanced across it , and descended , cascade - like ...
... rain and frost better than the less coherent tuffs around them . The floor of the great hollow forms a desolate plain . Innumerable currents of lava have flowed into it , and some have advanced across it , and descended , cascade - like ...
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Common terms and phrases
accumulated acid action alumina amount angles anticlinal augite basalt beds blocks bottom calcareous called carbonate of lime carbonic acid chalk chemical clay cleavage cliffs coal coast colour consist containing coral cracks crystalline crystals denudation deposits depth described detrition distance district dolerite dykes earth earth's crust elevation erosion excavated fault feet felspar fissures Foraminifera formation formed fragments Geol glacier glauconite gradually granite greensand ground hills horizontal hornblende igneous rocks island joints Jukes lake land lava layers less limestone magnesia mass material matter metamorphic metamorphic rocks mica miles mineral mountain observed occur origin Orthoclase outcrops particles pebbles planes porphyritic portion present pressure produced quartz rain reef river salt sand sandstone shales shells shore side siliceous Silurian slope solid solution sometimes stones strata stratified rocks stream structure sulphate surface synclinal thickness tide tion Trans valley vertical volcanic waves