The international geography . the floor of each ocean isdiversified by ridges and troughs,the deepest parts frequently occur-ring not in the centre of the oceans,but comparatively near shore. Theconfiguration of the ocean floor is ofgreat practical importance for layingtelegraph cables ; but it is not neces-sary to describe it in detail greatest depth hitherto reportedin the ocean is, 5,269 fathoms (or sixmiles) to the east of the Ladrones inthe North Pacific. In the south-westPacific to the east of the KermadecIslands soundings of 5,155 fathomsand 5,147 fathoms were ar
The international geography . the floor of each ocean isdiversified by ridges and troughs,the deepest parts frequently occur-ring not in the centre of the oceans,but comparatively near shore. Theconfiguration of the ocean floor is ofgreat practical importance for layingtelegraph cables ; but it is not neces-sary to describe it in detail greatest depth hitherto reportedin the ocean is, 5,269 fathoms (or sixmiles) to the east of the Ladrones inthe North Pacific. In the south-westPacific to the east of the KermadecIslands soundings of 5,155 fathomsand 5,147 fathoms were are the only records of depths exceeding 5,000 fathoms, thoughsoundings in depths between 4,000 and 5,000 fathoms are comparativelynumerous. The greatest depth known in the Atlantic is 4,660 fathoms, tothe north of the West Indies, while in the Indian Ocean no depth approach-ing 4,000 fathoms has hitherto been found, the deepest sounding being littleover 3,200 fathoms. It is worthy of remark that Sir James Clark Ross ran out 60. Fig 37.—Configuration of the Bed ofthe Atlantic Ocean, showing contourlines of 100 fathoms (dotted), 1,000,2,000 and 3,000 fathoms of over fathoms is in solidblack. The Oceans 6i 4,000 fathoms of line in the Southern Ocean, to the south of South Georgia,but in 1904 Dr. Bruce found the depth at this spot to be only 2,660 floor of the ocean on the whole lies about 2^ miles below the averagelevel of the continental land surface (see Fig. 24). Land and Sea.—The margin of the hydrosphere where it touches theprotuberant parts of the lithosphere is the primary dividing line of theEarth for most human purposes, separating the water from the land. Theexact areas of the oceans and the land cannot be ascertained until theArctic and Antarctic regions have been fully explored, but for the knownparts of the Earth the proportion of sea to land is about 2-5 to i, or in otherwords 72 per cent, of the surface is sea, and 28 per cent. land. T
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeography, bookyear19
