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4/9/10 12:55 PMGEOSC 10: Geology of the National Parks (Web, merged), SP10Page 8 of 913.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 IIcontain fossils similar to those shown in sample II. It is likely that:A.Sample I is from Graham Spanier’s backyard, and Sample II is from Joe Paterno’s backyard.B.Sample I is from high in the cliffs of the Canyon, and sample II is also from high in the cliffs of the Canyon.C.Sample I is from higher in the cliffs of the Grand Canyon, and sample II is from much lower, nearer to theriver.D.Sample I is from low in the cliffs, near the river, and sample II is also from low in the cliffs, near the river.E.Sample I is from lower, nearer the river, and sample II is from higher in the cliffs of the Grand Canyon.Sample I shows reptile tracks from the fossil sand dunes of the Coconino far up the side of the Canyon, and thus shows the presence of complexcreatures. Sample II includes algal-mat deposits (stromatolites) from the Precambrian Chuar Group of the Grand Canyon Supergroup, deep in theCanyon near the river, from a time when biology was not a whole lot more diverse than algal mats.Points Earned:1/114.Geological evidence based on several radiometric techniques has provided a scientifically well-accepted age forthe Earth. Represent that age of the Earth as the 100-yard length of a football field, and any time interval canbe represented as some distance on the field. (So something that lasted one-tenth of the age of the Earth wouldbe ten yards, and something that lasted one-half of the age of the Earth would be fifty yards.) On this scale,how long is written history?
4/9/10 12:55 PMGEOSC 10: Geology of the National Parks (Web, merged), SP10Page 9 of 9Points Earned:1/1Your Response:BDoneIf you have any questions, please contact Angel Support