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Points Earned:1/1Correct Answer:AYour Response:A12.The picture above shows a very hard piece of rock about six inches across, in the Grand Canyon. The surface of the rock looks rather different from the surfaces of many other rocks.What made this odd-looking surface? A.The wind, which has been primarily responsible for carrying away sand band which sand-blasts rocks with theB.A glacier; the high plateaus adjacent to the canyon had ice-age glaciers that hcarve the canyon.C.The river; because the rocks are still there, this shows that rivers cannot reallyerode hard rocks and thus that the river could not have carved the canyon.D.A fault, which dropped old rocks so that they were preserved in Death-Valleyvalleys and so were not eroded away.
E.The river, which blasted the rock with sand- and silt-laden water during floodthis shows that even hard rocks can be eroded by rivers.The Canyon was carved by the Colorado River. Glaciers have not been there, and while wind andfaults can change the appearance of rocks, none makes something like this river-polished rock, asyou saw in one of the Grand Canyon V-Trips.Points Earned:1/1Correct Answer:EYour Response:E13.In the two pictures above, I and II, show traces of former life in rocks from the Grand Canyon. Each is "typical";the rocks near sample I contain fossils similar to those shown in sample I, and the rocks near sample II contain fossils similar to those shown in sample II. It is likely that: