Show Carving the Grand Canyon The poplar Idea that earthquakes and volcanic ex III os Ions played part Ip forming the Grand canyon of the Colorado river Is thought by the best authorities to be without foundation We are now told that the canyon was cut out entirely ° by the water of the river and that tho most effective tool employed was the quartz sand brought down front the sources of the river In the mountains I harder the rock than strata any In ° f the which cunstlluenls This he sand of Is canyon has been carved Hurled by the swift wtor against tho sides nV5b2 of the stream It cuts the rock as easily ns a file cuts soft ironharp ers Weekly |