The Student's Handbook of Physical Geology |
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Page 11
... streams of lava or molten rock are so often poured forth , prove that some parts of the interior at any rate are so heated that solid rocks are rendered perfectly fluid . But the lavas derived from existing volcanoes form only a small ...
... streams of lava or molten rock are so often poured forth , prove that some parts of the interior at any rate are so heated that solid rocks are rendered perfectly fluid . But the lavas derived from existing volcanoes form only a small ...
Page 20
... streams . Successive eruptions frequently take place from the same vent , but minor cones are often formed on the flanks of the larger one , and lesser eruptions proceed from them . Volcanoes are sometimes isolated mountains like ...
... streams . Successive eruptions frequently take place from the same vent , but minor cones are often formed on the flanks of the larger one , and lesser eruptions proceed from them . Volcanoes are sometimes isolated mountains like ...
Page 23
... streams of incandescent lava are poured forth . In other cases periods of quiescence alternate with periods of activity , and when eruptions do occur they are generally of a violent description . From the records which we possess ...
... streams of incandescent lava are poured forth . In other cases periods of quiescence alternate with periods of activity , and when eruptions do occur they are generally of a violent description . From the records which we possess ...
Page 24
... , which often work more damage and destruction than the streams of lava . 1 See " Volcanoes , " by J. W. Judd , p . 33 . Besides steam the following gases are emitted from volcanoes : 24 [ SEC . I. INFLUENCE OF INTERNAL CAUSES .
... , which often work more damage and destruction than the streams of lava . 1 See " Volcanoes , " by J. W. Judd , p . 33 . Besides steam the following gases are emitted from volcanoes : 24 [ SEC . I. INFLUENCE OF INTERNAL CAUSES .
Page 26
... stream is sometimes wrinkled and twisted into ropy forms , such as are often seen on the sur- faces of artificial slags ; this is generally the case when the current moves slowly , and gives off but little steam or gas of any kind ...
... stream is sometimes wrinkled and twisted into ropy forms , such as are often seen on the sur- faces of artificial slags ; this is generally the case when the current moves slowly , and gives off but little steam or gas of any kind ...
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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