If you want an absolute date (number of years) rather than older/younger, you can count layers for young things, or use radiometric techniques for young things or for old ones. Uniformitarian calculations aren’t very accurate.Points Earned:1/1Correct Answer:BYour Response:B 10.Two yellow lines have been drawn on the picture by the instructional team. These lines follow an interesting surface. This surface is: A.A great fault, where pull-apart Death-Valley-type faulting dropped rocks so that they could be preserved from erosion and seen today.B.A great unconformity, with sedimentary rocks above resting on igneous and metamorphic rocks below.C.A great unconformity, with sedimentary rocks above resting on younger
sedimentary rocks below.D.A great unconformity, with sedimentary rocks above resting on older sedimentary rocks below.E.A great fault, where push-together action shoved the upper rocks over the lower ones.John Wesley Powell, of the United States Geological Survey, and the leader of the first boat trip through the Grand Canyon, called the feature marked by the yellow lines “The Great Unconformity”. It separates horizontal Paleozoic sedimentary rocks, above, from inclined Precambrian sedimentary rocks, below.Points Earned:1/1Correct Answer:DYour Response:D 11.The above photograph was taken in the Grand Canyon, and shows a cliff that is approximately 30 feet high. What are the rocks in the cliff?
This is the Vishnu Schist and Zoroaster Granite, rocks from the heart of a mountain range. The river is just barely out of the picture to the bottom. Points Earned:1/1Correct Answer:DYour Response:D
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- Geology, Quiz, rocks