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Are you ready for tomorrow’s quiz? A.YES! The study guide and the practice test helped a ton! B.I think so…but I should look over my notes some more. C.I am lost.
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Molds, casts, coprolites, and petrified wood are all examples of ________. A.Disconformities B.Radioactive isotopes C.fossils D.unconformities
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The youngest rock layer in an undisturbed rock sequence occurs ___. A.At the top of the sequence B.Above the sedimentary rock layer C.At the bottom of the sequence D.Above the unconformity
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Radioactive dating enables geologists to determine A.The absolute ages of fossils B.The half-life of a fossil organisms C.The age of the atoms in a rock D.The relative ages of fossils
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The amount of time it takes for one- half of the original amount of an isotope to decay is known as its ____. A.Radioactivity B.Half-life C.Correlation D.Period
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Cyanobacteria use the process of photosynthesis to produce energy, and _____is given off as a waste product. A.Carbon dioxide B.Nitrogen C.Hydrogen D.Oxygen
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Evolution is the process by which organisms ______. A.Leave behind evidence of their existence. B.Adapt to changes in their environments C.Digest and grind their food D.Become preserved by mineral replacement
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Mummified animals found in dry caves can be examples of fossils with _____. A.Superposition B.Altered hard parts C.Original preservation D.Premineralization
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List the following units of geologic time in order from shortest to longest. A.epoch B.era C.eon D.period
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Which of the following is used to determine the relative age of a rock? A.Radiometric dating B.Correlation C.Relative-age dating D.Premineralization
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When part of the rock record is destroyed, the erosional gap that forms is a(n) _______. A.Superposition B.Key bed C.Inclusion D.Unconformity
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Index fossils are useful to geologists if the fossils _____. A.Are scarce B.Are not easily recognized C.Have lived over a short period of time D.Are not widely distributed geographically.
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Which of the following is used to determine the absolute age of a rock? A.Radiometric dating B.Correlation C.Relative-age dating D.Premineralization
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Which layer in this diagram is the oldest? A.K B.P C.Q D.O
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Which layer in this diagram is the youngest? A.K B.P C.Q D.O
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Layer P is called a(n) ______________. A.Unconformity B.Fault C.Inclusion D.Intrusion
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List the following rock layers in order from oldest to youngest. A.H B.J C.P D.O E.L
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Short Answer Questions: Type your response using your keypad. PRACTICE: What is the room number of this classroom? 257 1
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Earth is _______ billion years old. 4.6 0.1
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The half-life of carbon-14 is 5370 years. A sample contains 180 grams of carbon initially. Now it contains 11.25 grams. How many half- lives have passed? A.2 B.3 C.4 D.5
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The half-life of carbon-14 is 5370 years. A sample contains 210 grams of carbon initially. How much will be left after 3 half- lives? A.105 grams B.52.5 grams C.26.25 grams D.13.125 grams
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Which geologic principle is used when a geologist observes an outcrop of rocks and determines the bottom layers is the oldest? A.Uniformitarianism B.Original horizontality C.superposition D.inclusion
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Which of the following is NOT a likely source of the Precambrian Earth’s heat? A.radioactivity B.Asteroid impact C.Increased solar activity D.Gravitational contraction
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Remains of organisms in rocks are ____. A.Half-lives B.fossils C.unconformities D.extinctions
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Radiometric dating indicates that Earth is ______ years old. A.2000 B.5000 C.3.5 billion D.4.6 billion
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If there is 16 grams of Carbon-14 were in the original organism, how much will be left after 2 half-lives? 4141
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The next smaller division of geologic time after the era is a(n) A.period B.stage C.epoch D.eon
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One of the earliest forms of life on Earth was the _____. A.gymnosperm B.cyanobacteria C.angiosperm D.dinosaur
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Dinosaurs lived during the ____ Era. A.Precambrian B.Paleozoic C.Mesozoic D.Cenozoic
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