. The Earth beneath the sea : History . CROSSING NEARLY PARALLELS TRENCH AXIS J' 'NV 9500 _/^ â â 'J Fig. 4. Cross-sections of the Philippine Trench traced from ^irang'ej- Precision Depth Recorder tapes. Sounding scales corrected after Matthews (1939). (See Fig. 3 for location of the sections.) Note:âSince a wide-beam sounder was employed, many side echoes appear as early, late or faint returns. The upper surface, ordinarily accepted as the sounding trace, is actually the envelope of minimum reflection times. 15âs. m

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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom