. A regional geography of the world, with diagrams and entirely new maps . other in thePamirs, the roof of the world. To the east of Tibetthe older highlands of southern China was a bulwark ofresistance to the earth movements which formed thesechains, and therefore the latter turn southwards wherethey can be traced through Indo-China and the EastIndies (see Fig. 74). To the north of this highland belt are extensiveplains stretching to the Arctic Ocean, and consisting,for the most part, of undisturbed, unfolded, sedimentaryrocks which lie in horizontal layers, but, as Fig. 74shows, the western
. A regional geography of the world, with diagrams and entirely new maps . other in thePamirs, the roof of the world. To the east of Tibetthe older highlands of southern China was a bulwark ofresistance to the earth movements which formed thesechains, and therefore the latter turn southwards wherethey can be traced through Indo-China and the EastIndies (see Fig. 74). To the north of this highland belt are extensiveplains stretching to the Arctic Ocean, and consisting,for the most part, of undisturbed, unfolded, sedimentaryrocks which lie in horizontal layers, but, as Fig. 74shows, the western portion has been covered by depositsof silt and alluvium which have been spread over thearea by the rivers. To the south of Asia we have the two plateaus of 28; 286 ASIA Arabia and the Deccan, both remnants of a former vastplateau continent which stretched across the world fromwest to east (Fig. 75). Both are bordered by scarpsand are so tilted that their long slope is towards the east,and both are separated from the mass of the continent STRUCTURALDl VI SIONS OF Fh;. 74.—Tne structural divisions of Asia. Plateaus of unfolded i lowlands of recent mountains and enclosed of rocks folded in ancient times now greatly denuded and fractured block mountains and basins. by alluvial plains (Mesopotamia and the Indo-GangcticPlain) which have been built up by river deposits (Fiff- 74). The true eastern limits of Asia arc to be found in the festoons of volcanic islands which stretch southwards froni the peninsula of Kamchatka. The seas between rilVSICAL FRATURKS 287 these is^:inds and the mainland occuj)y basins which havebeen created b>- the subsidence of blocks of the earthscrust. We should note that this cast Asiatic islandchain is part of a great volcanic belt which runs allround the mar<;ins of the Pacific Ocean (iMg. 148). We have still to consider the eastern margins of themain continental mass of Asia
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeography, bookyear19
