. The Earth beneath the sea : History . Surveyed Portions Unsurveyed Portions, Certain Connections Approximate Position of Probable Extension Diagrammatic Possible Tributaries Submarine Cable Breaks Fig. 20. Northwest Atlantic Mid-Ocean Canyon. (After Heezen et al., 1959.) width from 3 to 5 mi and in depth below the adjacent sea floor from 10 to 100 fm. There is a consistent asymmetry about the canyon, the west wall being 10-15 fm higher than the east wall (Fig. 22). The canyon has been mapped by more than 80 echo-sounding profiles. Surprisingly, the canyon does not follow the axis of greatest

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. The Earth beneath the sea : History . Surveyed Portions Unsurveyed Portions, Certain Connections Approximate Position of Probable Extension Diagrammatic Possible Tributaries Submarine Cable Breaks Fig. 20. Northwest Atlantic Mid-Ocean Canyon. (After Heezen et al., 1959.) width from 3 to 5 mi and in depth below the adjacent sea floor from 10 to 100 fm. There is a consistent asymmetry about the canyon, the west wall being 10-15 fm higher than the east wall (Fig. 22). The canyon has been mapped by more than 80 echo-sounding profiles. Surprisingly, the canyon does not follow the axis of greatest depth in the ocean basin but tends to the western side. The average slope of the sea floor at right angles to the axis of the canyon in most

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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom