. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. Fig. 159. — Scalpellumon a Manganese Nodule( Challenger ). Fig. 160.—Spherule with MetallicNucleus coated with BlackMagnetite, supposed to be ofCosmic Origin (Challenger). teeth of sharks and ear-bones of whales, impregnatedand coated more or less thickly by the peroxides ofiron and manganese. In the Red Clays, also, numerousminute magnetic spherules (Fig. 160), some with OOZES 219 metallic nuclei, have been met with, and have also beenextracted from the manganese nodules after these
. Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen. Fig. 159. — Scalpellumon a Manganese Nodule( Challenger ). Fig. 160.—Spherule with MetallicNucleus coated with BlackMagnetite, supposed to be ofCosmic Origin (Challenger). teeth of sharks and ear-bones of whales, impregnatedand coated more or less thickly by the peroxides ofiron and manganese. In the Red Clays, also, numerousminute magnetic spherules (Fig. 160), some with OOZES 219 metallic nuclei, have been met with, and have also beenextracted from the manganese nodules after these havebeen broken up in a mortar ; these spherules are sup-posed to have fallen from interstellar space, and arehence called cosmic spherules. In some positions,again, there are small zeolitic crystals (phillipsite), asindividuals, twins, stellate groups, and spheruliticaggregations ; these are supposed to be secondary pro-ducts, formed in situ, arising from the decompositionof the basic volcanic particles present in the deposits. Red Clay is estimated to cover an area of about51,500,000 square miles (o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectocean, bookyear1912
