The Student's Handbook of Physical Geology |
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Page 11
... 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 portion 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 portion of ...
Page 20
... lava now and then boil up , and either break through the sides of the cone or run over the lip of the crater , and flow down into the adjacent country in the form of lava streams . Successive eruptions frequently take place from the ...
... lava now and then boil up , and either break through the sides of the cone or run over the lip of the crater , and flow down into the adjacent country in the form of lava streams . Successive eruptions frequently take place from the ...
Page 21
... lava which has risen from below is represented by the thick black lines which intersect the mountain in all directions . It will readily be imagined that when molten lava is being forced up inside a volcano , some of it will be injected ...
... lava which has risen from below is represented by the thick black lines which intersect the mountain in all directions . It will readily be imagined that when molten lava is being forced up inside a volcano , some of it will be injected ...
Page 22
... Lava . A. Veins of slaggy lava in volcanic tuff ; Stromboli . B. Dykes of lava in sand and scoriæ ; Etna . to build up . The volcano then presents the appearance of a truncated cone with a huge gaping hollow in the centre . Subsequent ...
... Lava . A. Veins of slaggy lava in volcanic tuff ; Stromboli . B. Dykes of lava in sand and scoriæ ; Etna . to build up . The volcano then presents the appearance of a truncated cone with a huge gaping hollow in the centre . Subsequent ...
Page 23
... lava rises and finds egress either from the crater or from lateral openings . 5. When the flow of lava ceases there is frequently a discharge of black sand or comminuted pumice . In some cases the eruption does not proceed farther than ...
... lava rises and finds egress either from the crater or from lateral openings . 5. When the flow of lava ceases there is frequently a discharge of black sand or comminuted pumice . In some cases the eruption does not proceed farther than ...
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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 chalk chemical clay cleavage cliffs coal coast colour consist containing coral cracks crystalline crystals deposits depth described detrition distance district dolerite Dolomite dykes earth elevation erosion fault feet felspar fissures Foraminifera formation formed fragments frequently Geol glacier glauconite gradually granite greensand ground hills horizontal hornblende igneous rocks iron island joints Jukes lake land lava layers less Leucite limestone magnesia mass material matter metamorphic metamorphic rocks mica miles mineral mountain occur origin Orthoclase outcrops oxides particles pebbles planes porphyritic portion present pressure produced quartz rain reef river salt sand sandstone shale shells shore side silicate silicate of alumina slope solid solution sometimes stone strata stratified rocks stream structure substances sulphate surface thickness tide tion tuffs valley vertical volcanic waves