. The geography of New Zealand. Historical, physical, political, and commercial . Fir, 7. I., the gradual cooling of the earth; II., the loadingof the ocean bed through denudation of the. landsurface. I.—Cooling of the Earth.—Observations in deepmines show that the temperature of the earthincreases with the depth below the surface; and at the depth of a few miles. M ((((n (r( ((((( u\ the temperature mustbe very high, as theheat is sufficient tobring what are on thataccount called igneousrocks to the meltingpoint. The averagerate of increase nearthe surface is knownto be about 1° Fahren-heit f
. The geography of New Zealand. Historical, physical, political, and commercial . Fir, 7. I., the gradual cooling of the earth; II., the loadingof the ocean bed through denudation of the. landsurface. I.—Cooling of the Earth.—Observations in deepmines show that the temperature of the earthincreases with the depth below the surface; and at the depth of a few miles. M ((((n (r( ((((( u\ the temperature mustbe very high, as theheat is sufficient tobring what are on thataccount called igneousrocks to the meltingpoint. The averagerate of increase nearthe surface is knownto be about 1° Fahren-heit for every 51 feetof descent; but thatrate cannot continue to all depths, for at thedepth of 200 to 400 miles the temperature wouldbe equal to the temperature of the sunssurface. The probability is that the rate ofincrease of temperature diminishes with the depth,and that, about 30 miles below the surface, Q Fig. 8. 242 GEOGRAPHY OF NEW ZEALAND
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