. The Earth beneath the sea : History . Fig. 8. 34° 53'N, 16° 32'W. Depth 1550 m. Near the peak of a seamount north of Madeira. Area of picture 3 by 2J m. (Photo by ) Boulders of volcanic basalt about 30 cm across partly buried by Globigerina ooze with a thin coating of manganese. The camera is looking into the side of the seamount. breaking up of bedrock by some submarine weathering process : in the case of a cooling lava flow, the breaking up may take place very shortly after solidifica- tion as a result of internal stress set uj) by uneven cooling. Secondly, they may be transported to
. The Earth beneath the sea : History . Fig. 8. 34° 53'N, 16° 32'W. Depth 1550 m. Near the peak of a seamount north of Madeira. Area of picture 3 by 2J m. (Photo by ) Boulders of volcanic basalt about 30 cm across partly buried by Globigerina ooze with a thin coating of manganese. The camera is looking into the side of the seamount. breaking up of bedrock by some submarine weathering process : in the case of a cooling lava flow, the breaking up may take place very shortly after solidifica- tion as a result of internal stress set uj) by uneven cooling. Secondly, they may be transported to the area by some agency such as ice rafting or ejection from a volcano. Thirdly, they may have grown in situ by the accumulation of chemical or biochemical deposits to form, for example, manganese or phosi)horite nodules. Typical boulders produced by the fragmentation of solid rock are shown in Fig. 8 which are highly vesicular basalts on the sides of a seamount. Parallel
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
