The international geography . V^7yf^ MW^ Hf •.itrr- j-r--->: v^/mff\ .•::.vp iii * \ r J ? ?>• Fig. 27.—Diagrammatic section 0/ Crust-Block Fig. 2S.—Diagrammatic section of Rift-Valley. Strata subjected to severe stresses relieve the strain not by folding but bycracking, and blocks of the crust are thrust up or allowed to drop downbetween parallel cracks or janils. The raised or lowered masses mayretain their original position or be tilted, and in either case they give riseto crnst-block monntains (the Schollengcbirge of the Germans), or to rift-valleys {Grabcn), such as the u
The international geography . V^7yf^ MW^ Hf •.itrr- j-r--->: v^/mff\ .•::.vp iii * \ r J ? ?>• Fig. 27.—Diagrammatic section 0/ Crust-Block Fig. 2S.—Diagrammatic section of Rift-Valley. Strata subjected to severe stresses relieve the strain not by folding but bycracking, and blocks of the crust are thrust up or allowed to drop downbetween parallel cracks or janils. The raised or lowered masses mayretain their original position or be tilted, and in either case they give riseto crnst-block monntains (the Schollengcbirge of the Germans), or to rift-valleys {Grabcn), such as the upper Rhine plain or the great rift-valleys ofthe Dead Sea, Red Sea, and East Africa (Fig. 445). These, when of relativelyrecent origin, are wild and rugged, giving rise to a country full of grand 54 The International Geography scenery but presenting great obstacles to traffic. The movement of crust blocks separated by a great fault is still to be detected in many cases ; it usually occurs in the form of slight slips accompanied by earthquake shocks. Lines of faulting are of course lines of weakness in the crust, and consequentl}^ afford a favourabl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeography, bookyear19
