354 



INDEX 



Clouds, 257 



Coastal plains, 6 



Cold currents, 330 



Cold waves, 294 



Colorado Canyon, 73 



Colorado River, delta of, 95, 97 



Columnar structure, 180 



Comets, 216 



Compound alluvial fan, 85 



Conduction, 230, 231 



Conglomerate, 350 



Continents, 3 



grouping of, 4 



Continental climates, 310, 314 

 Continental glaciers, 105, 111, 129 



changes produced by, 133 



of Europe, 131, 132 



of North America, 132 

 Continental shelf, 4 

 Contour lines, 6 



maps, 6 



Convection, 230, 231 

 Coral reefs, 346 

 Cosmic dust, 19 

 Crater, 161 

 Creeks, 52 

 Creep, 44, 334 

 Creep of sea-water, 330 

 Crete, 183 

 Crevasses, 107 

 Crustal movements, 16, 18 

 Cumberland Gap, 83 

 Cumulus clouds, 258 

 Currents, 152 

 Cyclones, 285 



movements of, 289 

 Cyclonic wind, 281 



Daily range of temperature, 248 



Dead Sea, 145 



Deeps, 324 



Deflection of winds, 285 



Degrees, lengths of, 210 



Delaware Water Gap, 78 



Delta fingers, 97 



Delta of Lake St. Clair, 93 



of the Colorado River, 95, 97 



of the Mississippi, 94, 95, 158 



of the Nile, 96 

 Deltas, 93, 96, 126 

 Density and movement of sea- water, 



329 

 Deposition by glaciers, 134 



by gro'und-water, 41 



by running water, 83 



Deposition continued 



by waves, shore-currents, etc., 155 



of drift, 121 

 Devil's Lake, Wis., 135 

 Dew, 33, 260 

 Dew-point, 257 

 Diatom ooze, 349 

 Dikes, 180 

 Distributaries, 95 

 Distribution of rainfall, 260 

 Diverted stream, 82 

 Doldrums, 315 

 Dolphin Ridge, 326 

 Drainage and drift, 137 

 Drainage system, 72 

 Dredging, 348 

 Drift, 71, 334 

 Drift and drainage, 137 

 Drift, disposition of, 123 



glacial, 121 

 Drift of sea-warer, 333 

 Driftless area, 130 

 Drowning of valleys, 80 

 Drumlins, 125 

 Dry winds, 317 

 Dunes, 21 



destruction by, 22 



distribution of, 22 



migration of, 23 

 Dust, 18 



cosmic, 19 



deposits of, 19 



in air, 19, 224 



meteoric, 19 



sources of, 18 



volcanic, 19 



Earth, axis of, 207 



distance from sun, 206 



form of, 205 



motions of, 206 



revolution of, 206 



rotation of, 206 



size of, 205 

 Earth tremors, 191 

 Earthquake, Californian, 196 

 Earthquake fissures, 200 

 Earthquakes, 191 



causes of, 199 



distribution of, 198 



effects of, 201 



frequency of, 197 



in Mississippi Valley, 194 

 Equinoxes, 213 

 Equatorial calms, 274 



