The New Encyclopaedia Britannica: Macropaedia: knowledge in depth. 19 vEncyclopaedia Britannica, Incorporated, 1981 - Encyclopedias and dictionaries |
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Page 297
... lava is extruded from fissures along the crests of oceanic ridges . There is no way of observing such erup- tions directly ; the nature and origin of the rocks can only be deduced from bottom photographs , dredge hauls , geophysical ...
... lava is extruded from fissures along the crests of oceanic ridges . There is no way of observing such erup- tions directly ; the nature and origin of the rocks can only be deduced from bottom photographs , dredge hauls , geophysical ...
Page 298
... lava , and there are usually long intervals between events , especially in older vol- canoes . The proportion of explosive pyroclastic ejecta is higher than that of oceanic volcanoes and in some regions may account for a larger volume ...
... lava , and there are usually long intervals between events , especially in older vol- canoes . The proportion of explosive pyroclastic ejecta is higher than that of oceanic volcanoes and in some regions may account for a larger volume ...
Page 314
... Lava flows may be common but may terminate abruptly with pyroclastic beds at their margins . Another compli- cating factor is that subaerial volcanic centres are gener- ally hilly or mountainous , and pyroclastic flows or mud and lava ...
... Lava flows may be common but may terminate abruptly with pyroclastic beds at their margins . Another compli- cating factor is that subaerial volcanic centres are gener- ally hilly or mountainous , and pyroclastic flows or mud and lava ...
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andesite Antarctic antibodies antigen atoms basalt basin bonds carbon cause cells centimetres central centre century chemical composition crystals cultural cycle cyclone earth east economic effect eruption evaporation feet feldspar feldspathoids flow freezing gabbro glaciers groundwater humidity Hungarian Hungary hunting hydrocarbons hydrogen hydrograph hydrologic hydrologic cycle hypnosis ice sheets icebergs Iceland ideology igneous rocks Illinois immunoglobulin immunological important increase India Indian industry intrusive kilometres king known lakes land lava layers lymphocytes mafic magma major melting ment metres miles millimetres minerals molecules mountain natural northern occur ocean parasitic percent philosophy plagioclase political population precipitation pressure produced rainfall range reaction region relatively result Reykjavík river runoff Samkhya snow social soil square kilometres structure surface temperature theory tion ture types United vapour Vedānta volcanic western wind zone