The Student's Handbook of Physical GeologyG. Bell, 1892 - 666 pages |
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Page 9
... less than 26.5 miles . That is to say , that the polar axis is almost exactly 26 miles shorter than an equatorial axis or line passing through the centre of the earth from one side of the equator to the other : or , again , as ...
... less than 26.5 miles . That is to say , that the polar axis is almost exactly 26 miles shorter than an equatorial axis or line passing through the centre of the earth from one side of the equator to the other : or , again , as ...
Page 11
... less than the average , but there are many causes which would tend to produce variations in the rate at which the temperature increases downwards . One of the most important is that of the relative conductivity of the rocks , some kinds ...
... less than the average , but there are many causes which would tend to produce variations in the rate at which the temperature increases downwards . One of the most important is that of the relative conductivity of the rocks , some kinds ...
Page 21
... less regular layers inclined at various angles , but all sloping away from the central axis . On either side are seen minor cones com- posed entirely of dust , cinders , and stones which have been thrown up from these lateral vents ...
... less regular layers inclined at various angles , but all sloping away from the central axis . On either side are seen minor cones com- posed entirely of dust , cinders , and stones which have been thrown up from these lateral vents ...
Page 29
... less gaseous matter , generally has a crust that is wrinkled and twisted into ropy forms , such as are often seen on the surfaces of artificial slags . The liquidity of a lava seems to depend partly on chemical composition , partly on ...
... less gaseous matter , generally has a crust that is wrinkled and twisted into ropy forms , such as are often seen on the surfaces of artificial slags . The liquidity of a lava seems to depend partly on chemical composition , partly on ...
Page 30
... less explosive manner . Lastly , as to the temperature of lavas at the moment of issue , there is little doubt that this differs in different cases and places , but its actual amount in any case has not yet been ascertained , owing to ...
... less explosive manner . Lastly , as to the temperature of lavas at the moment of issue , there is little doubt that this differs in different cases and places , but its actual amount in any case has not yet been ascertained , owing to ...
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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