The Student's Handbook of Physical Geology |
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Page 14
... stones and rocks vary in their specific gravity from about 2 to 3 , that of some of the most important rocks being given in the following table : - Kind of Rock . 1. Greenstone ( Diorite ) 2. Basalt . 3. Granite 4. Marble 5. Slate 6 ...
... stones and rocks vary in their specific gravity from about 2 to 3 , that of some of the most important rocks being given in the following table : - Kind of Rock . 1. Greenstone ( Diorite ) 2. Basalt . 3. Granite 4. Marble 5. Slate 6 ...
Page 15
... stone into an eighth . The mean density of the globe ought then to be about 11 instead of only 5 or 6 . Now , we have already seen that the interior of the earth may still have a very high temperature of its own , and if this be the ...
... stone into an eighth . The mean density of the globe ought then to be about 11 instead of only 5 or 6 . Now , we have already seen that the interior of the earth may still have a very high temperature of its own , and if this be the ...
Page 20
... stones and ashes which have been violently discharged into the air , and have fallen on all sides round the central orifice or crater as it is called . Every eruption adds to the pile and increases the height and magnitude of the ...
... stones and ashes which have been violently discharged into the air , and have fallen on all sides round the central orifice or crater as it is called . Every eruption adds to the pile and increases the height and magnitude of the ...
Page 21
... stones and ashes which have been ejected from the central vent , and are disposed in more or less regular layers inclined at various angles , but all sloping away from the central axis . On either side are seen minor cones com- posed ...
... stones and ashes which have been ejected from the central vent , and are disposed in more or less regular layers inclined at various angles , but all sloping away from the central axis . On either side are seen minor cones com- posed ...
Page 23
... 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 appearance of flames . 4. The lava rises and finds ...
... 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 appearance of flames . 4. The lava rises and finds ...
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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