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13. The two pictures above, I and II, show fossils inrocks from the Grand Canyon. Each is "typical"; the rocks near sample Icontain fossils similar to those shown in sample I, and the rocks nearsample II contain fossils similar to those shown in sample II. It is likely that:
A) Sample I is from high in the cliffs of the Grand Canyon, and sample II is from much lower, near the river. B) Sample I is from near the river, and sample II is from high in the cliffs of the Grand Canyon. C) Sample I is from near the river, and sample II is also from near the river. D) Sample I is from high in the cliffs of the Canyon, and sample II is also from high in the cliffs of the Canyon. E) Sample I is from the north shore of Lake Winna-Bango, and sample II is from the south shore, where there is plenty of moose moss to munch. Correct Answer(s):A Feedback: Sample I is a wonderful shell hash, or coquina, from the Supai Rocks well up the side of the Canyon, and contains shells from a great diversity of different creatures. Sample II includes algal-mat deposits (stromatolites) from the Precambrian Chuar Group of the Grand Canyon Supergroup, deep in the Canyon near the river, from a time when biology was not a whole lot more diverse than algal mats. Lake Winna-Bango featured in the gripping Dr. Suess tale of Thidwick, the Big-Hearted Moose, but is not pictured here. Table for Individual Question Feedback Points Earned: 1.0/1.0 14. Geological evidence based on several radiometric techniques has provided a scientifically well-accepted age for the Earth. Represent that age of the Earth as the 100-yard length of a football field, and any time interval can be represented as some distance on the field. (So something that lasted one-tenth of the age of the Earth would be ten yards, and something that lasted one-half of the age of the Earth would be fifty yards.) On this scale, the time from when dinosaur extinction made space for large mammals, until today, would be represented by how far on the football field?
Table for Individual Question Feedback Points Earned: 1.0/1.0 Correct Answer(s):D 15. What is accurate about the scientific results learned by counting tree rings and other annual layers?