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Sample I is a wonderful shell hash, or coquina, from the Supai Rockswell up the side of the Canyon, and contains shells from a greatdiversity of different creatures. Sample II includes algalmat deposits(stromatolites) from the Precambrian Chuar Group of the GrandCanyon Supergroup, deep in the Canyon near the river, from a timewhen biology was not a whole lot more diverse than algal mats. LakeWinnaBango featured in the gripping Dr. Suess tale of Thidwick, theBigHearted Moose, but is not pictured here.1 / 1 ptsQuestion 14Geological evidence based on several radiometric techniques has provided ascientifically wellaccepted age for the Earth. Represent that age of the Earthas the 100yard length of a football field, and any time interval can berepresented as some distance on the field. (So something that lasted one
3/31/2019RockOn #10: GEOSC 10 Spring 2019, Merged14/15tenth of the age of the Earth would be ten yards, and something that lastedonehalf of the age of the Earth would be fifty yards.) On this scale, how longhave you personally been alive?10 yards.50 yards.1 yard.Much less than the thickness of a sheet of paper.Correct!Correct!1 inch.If the 4.6 billion years of Earth history are 100 yards, then the fewthousand years of written history are just onemillionth of that history,just over the thickness of a sheet of paper. And your small piece ofwritten history must be only a small fraction of a sheet of paper,roughly 1/200th or so.1 / 1 ptsQuestion 15What is accurate about the scientific results learned by counting tree rings?Correct!Correct!
3/31/2019RockOn #10: GEOSC 10 Spring 2019, Merged15/15Quiz Score:15out of 15