The New Encyclopaedia Britannica, Volume 6Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 49
... kilometres ( 25 miles ) thick in continental regions and is highly het- erogeneous , composed largely of rocks varying in com- position between granite and basalt . Beneath the deep oceanic basins , the crust is about five kilometres ...
... kilometres ( 25 miles ) thick in continental regions and is highly het- erogeneous , composed largely of rocks varying in com- position between granite and basalt . Beneath the deep oceanic basins , the crust is about five kilometres ...
Page 53
... kilometres ( 90 miles ) . Low - velocity zone . In many oceanic regions , the up- per 70 kilometres ( 40 miles ) of the upper mantle exhibits an S - wave ( shear - wave ) velocity of about 4.6 kilometres ( 2.9 miles ) per second . Below ...
... kilometres ( 90 miles ) . Low - velocity zone . In many oceanic regions , the up- per 70 kilometres ( 40 miles ) of the upper mantle exhibits an S - wave ( shear - wave ) velocity of about 4.6 kilometres ( 2.9 miles ) per second . Below ...
Page 54
... kilometres ( 400 miles ) . Direct techniques are unable to reproduce pressures and temperatures oc- curring below about 600 kilometres ; detailed interpreta- tion of phase changes at greater depth rests heavily upon studies of analogue ...
... kilometres ( 400 miles ) . Direct techniques are unable to reproduce pressures and temperatures oc- curring below about 600 kilometres ; detailed interpreta- tion of phase changes at greater depth rests heavily upon studies of analogue ...
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19th century Africa agriculture America Azande Basin British Byzantine capital Catholic central centre changes Chinese Christian Constantinople continental continued core crinoids crust cubic centimetre cultural density depth Earth earthquakes East African Eastern echinoderms eclipse economic economists ecosystem Ecuador ecumenical equations Europe export feet forecasting fossil geoid geological geomagnetic geosyncline German gravity groups holothurians important income increase Indian industry investment isostasy Kenya kilometres labour Lake Lake Victoria land magnetic field major mantle ment metres miles modern Mombasa Monophysite Moon mountains movement nomic North northern ocean organization Orthodox Church output Paleozoic patriarch percent peridotite period planning political population Precambrian production region River rocks Russian sector seismic slope social society solar South Soviet species structure surface Tanzania temperature theory tion trade traditional tube feet Uganda underdeveloped countries United waves West Western