The Student's Handbook of Physical GeologyG. Bell and Sons, 1884 - 514 pages |
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Page 27
... hard , compact , and frequently a crystalline stone . The gradual cooling of the lava causes it to contract , and leads to the production of cracks , which traverse the whole mass from top to bottom . These are sometimes so regular as ...
... hard , compact , and frequently a crystalline stone . The gradual cooling of the lava causes it to contract , and leads to the production of cracks , which traverse the whole mass from top to bottom . These are sometimes so regular as ...
Page 39
... hard and compact rocks , less rapidly through soft and incoherent beds . Mr. Mallet has experimented by exploding gun- powder and calculating the velocity of the shock so pro- duced in different rocks . He found that the wave tra ...
... hard and compact rocks , less rapidly through soft and incoherent beds . Mr. Mallet has experimented by exploding gun- powder and calculating the velocity of the shock so pro- duced in different rocks . He found that the wave tra ...
Page 40
... hard into overlying soft rocks is such that a very small shock is propagated through the latter . Thus the Lisbon earthquake was felt in Scotland , but not in England , and the reason is supposed to be that the wave travelled through the ...
... hard into overlying soft rocks is such that a very small shock is propagated through the latter . Thus the Lisbon earthquake was felt in Scotland , but not in England , and the reason is supposed to be that the wave travelled through the ...
Page 43
... hard primary slate , which composed the foundation of the island , was still more curious : the superficial parts of some narrow ridges were as completely shivered as if they had been blasted by gunpowder . This effect , which was ...
... hard primary slate , which composed the foundation of the island , was still more curious : the superficial parts of some narrow ridges were as completely shivered as if they had been blasted by gunpowder . This effect , which was ...
Page 44
... hard rocks A being elevated , while the newer , B , remained horizontal . Previous to the earthquake there had been no room to pass between the sea and the base of the perpendicular cliff in which the Rimutaka range terminates in Cook's ...
... hard rocks A being elevated , while the newer , B , remained horizontal . Previous to the earthquake there had been no room to pass between the sea and the base of the perpendicular cliff in which the Rimutaka range terminates in Cook's ...
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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