. Elementary physical geography;. or grand division, draw heavylines representing the positions of the principal mountain-ranges. In what general drection does the rock waste of mountains move?Explain why. Give reasons why lowlands are more densely peopled than high-lands. 84 PHYSICAL GEOGRAPHY COLLATERAL READING AND REFERENCE McGee.—The Piedmont Plateau. National Geographic Magazine,vii, 261. Willis.—Physiography of the United States, pp. 169-202. Hayes.—Physiography of the United States, pp. 305-336. Powell.—Exploration of Grand Canon, pp. 181-193. United States Geological Survey Maps, the f
. Elementary physical geography;. or grand division, draw heavylines representing the positions of the principal mountain-ranges. In what general drection does the rock waste of mountains move?Explain why. Give reasons why lowlands are more densely peopled than high-lands. 84 PHYSICAL GEOGRAPHY COLLATERAL READING AND REFERENCE McGee.—The Piedmont Plateau. National Geographic Magazine,vii, 261. Willis.—Physiography of the United States, pp. 169-202. Hayes.—Physiography of the United States, pp. 305-336. Powell.—Exploration of Grand Canon, pp. 181-193. United States Geological Survey Maps, the following sheets:Tooele, Marion, Sierraville, Marysvillc, Kaihab, Fannerville, Spottsyl-vania, Mount Monadnock, Mount Mitchell, Huinmclstown, Relief Mapof United States, and others. CHAPTER V DESTRUCTIVE MOVEMENTS OF THE ROCK ENVELOPE;VOLCANOES AND THEIR PHENOMENA Of the various phenomena that attend changes in thelevel of the rock envelope, two of them, volcanoes andearthquakes, are noteworthy because the results are more. VESUVIUS, A TYPICAL CINDER CONE From a model.—Ajter Nasmyth. or less destructive. In the one case, great quantities ofmolten matter are ejected from fissures or vents, coveringvery large areas; in the other, there is a movement at 85 N 86 PHYSICAL GEOGRAPHY some part or other of the rock envelope, so sudden that atremor, or even a severe shock, occurs. Volcanoes.—A channel or vent in the rock envelopefrom which steam and molten rock are ejected with greatforce constitutes a volcano. In most instances clots of half-molten rock fall about the vent and build up a conical is sometimes called a volcano, but more properly,a cinder cone. At the top of the cinder cone is a cuj H-sha) leddepression called the crater or, if very large, a coklera. The channel or tube is the essential part of the volcano, and themountain or cinder cone, though rarely absent, is merely an incidentalfeature. The craters of the earth are small, compared with those of t
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