Geology for general readers1870 |
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Page viii
... HEAT , MAGNETISM , CRYSTALLISATION , AND OTHER SIMILAR FORCES - ILLUSTRATIONS OF THESE RESPECTIVE FORCES AND THEIR MODES OF ACTION - THEIR EFFECTS MOST PERCEPTIBLE IN THE OLDER ROCKS - THE SO - CALLED METAMORPHIC ROCK- SYSTEM APPARENT ...
... HEAT , MAGNETISM , CRYSTALLISATION , AND OTHER SIMILAR FORCES - ILLUSTRATIONS OF THESE RESPECTIVE FORCES AND THEIR MODES OF ACTION - THEIR EFFECTS MOST PERCEPTIBLE IN THE OLDER ROCKS - THE SO - CALLED METAMORPHIC ROCK- SYSTEM APPARENT ...
Page 38
... heat within the interior of our planet . Each of these agencies has its own mode of working - some chiefly wearing and degrading , some degrading and at the same time accumulating , and others solely reconstructing . Let us now glance ...
... heat within the interior of our planet . Each of these agencies has its own mode of working - some chiefly wearing and degrading , some degrading and at the same time accumulating , and others solely reconstructing . Let us now glance ...
Page 42
... , or simmering like the mud and sulphur vents that appear in the neighbourhood of almost every active volcano . Heat , indeed , is the great promoter of chemical change within the earth's crust ; and 42 WASTE AND RECONSTRUCTION .
... , or simmering like the mud and sulphur vents that appear in the neighbourhood of almost every active volcano . Heat , indeed , is the great promoter of chemical change within the earth's crust ; and 42 WASTE AND RECONSTRUCTION .
Page 43
... heat alone , that the solid strata , originally of sand , gravel , mud , and organic debris , owe their hardness and crystalline texture . Chemi- cal infiltrations and combinations are everywhere as opera- tive as these are , and ...
... heat alone , that the solid strata , originally of sand , gravel , mud , and organic debris , owe their hardness and crystalline texture . Chemi- cal infiltrations and combinations are everywhere as opera- tive as these are , and ...
Page 46
... heat - force , to which we can ascribe these upheavals and depressions of the crust ; but be this as it may , there can be no doubt of such oscillations , and that they form one of the appointed means by which the waste and ...
... heat - force , to which we can ascribe these upheavals and depressions of the crust ; but be this as it may , there can be no doubt of such oscillations , and that they form one of the appointed means by which the waste and ...
Common terms and phrases
accumulations ages America ancient antiquity areas arrangement aspects beds bituminous calcareous Cambrian Carboniferous Chalk changes chemical chiefly clays climate coal coal-fields course Cretaceous Crown 8vo crustacea crystalline debris decay deposits distribution of sea drifted dry land earth's crust eocene estuaries Europe existing extinct feet fishes flora and fauna formations forms fossils Geography geologists geology glacial epoch glacier globe gradually gravel heat higher igneous incessant ironstones islands lakes latitudes Laurentian lava less lignites limestones lower mammals masses matter MESOZOIC metamorphism mineral miocene nature newer numerous occur ocean Old Red Sandstone older Oolite operations organic PALEOZOIC partly period physical plants and animals pliocene portion present recent regions reptiles rivers rock-matter rocks rocky sand schists sea and land secondary sediments shales shell-fish shells silts Silurian Sketch soil species stage stone strata stratified surface terrestrial tertiary thickness tion Triassic variety vegetable veins vital volcano vulcanic zoophytes
Popular passages
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