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Geologic Time

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
show A record of the Earth's geologic history  
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show Layers of different rock types  
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Eon -   show
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Eras -   show
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show A division of geologic history that spans no more than one hundred million years  
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Epoch -   show
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James needs to write a report which will describe the ups and downs of mammals in a previous time period. Which should he use, eons or epochs? Why?   show
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show They want to learn more about the history of the Earth  
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show Periods  
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James needs to write a report which will describe the ups and downs of mammals in a previous time period. Which should he use, eons or epochs? Why?   show
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show Mammels  
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Why do many geologists study layers of strata?   show
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show An eon spans hundreds to thousands of millions of years, while eras span tens to hundreds of millions of years  
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show Helped establish our current understanding of the history of Earth. He studied sedimentary rocks, began comparitive anatomy, named the pterodactyl  
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show Periods  
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James Hutton -   show
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show The theory that Earth's features are mostly accounted for by gradual, small-scale processes that occurred over long periods of time  
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show Mammels  
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How does an eon differ from an era?   show
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Georges Cuvier -   show
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Catastrophism -   show
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show Thought that most of the features on the surface of the Earth were formed by slow, ongoing, geologic processes  
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show The theory that Earth's features are mostly accounted for by gradual, small-scale processes that occurred over long periods of time  
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Today, geologists believe mostly in _____, with a little bit of _____.   show
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James Hutton's theory of _____ earned him the title of 'The Father of Modern Geology.'   show
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Catastrophism assumes that the Earth's landscape was shaped by _____.   show
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show older  
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show The catastrophes in the Bible seemed to be on such large scales that they could account for the creation of things like mountains  
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Relative Dating -   show
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show The way rock layers are built up and changed by geologic processes  
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show A method in which scientists compare fossils in different rock strata to determine the relative ages of each  
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Radioactive Decay -   show
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Radiometric Dating -   show
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show X, Z, Y  
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In stratigraphic succession, scientists study the various _____ of rock.   show
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show Radioactive decay  
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The statement Rock A is fifty years older than Rock B is an example of _____.   show
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The statement Rock A is seventeen years old is an example of _____.   show
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Principle of Original Horizontality -   show
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show The youngest rock layers are closest to the top  
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show Rock formation that cut across other rocks must be younger than the rocks they cut across  
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show Foreign bodies of rock or mineral enclosed within another rock. Inclusions are always older than the sedimentary rock within which they're found  
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show Interfaces between discontinuous layer of rock  
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show Younger than  
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show An unconformity  
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show Sedimentary  
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If Sedimentary Layer A occurs above Sedimentary Layer C and Sedimentary Layer B is below Sedimentary Layer C, which of the following is the correct order of the layers (from oldest to youngest)?   show
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Any inclusion found within sedimentary rock must be _____ that rock.   show
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Radiometric dating (also known as radioactive dating) -   show
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show The process by which an unstable atomic nucleus loses energy by releasing radiation  
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show The unstable nuclide that undergoes radioactive decay  
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Daughter nuclide -   show
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Alpha decay -   show
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Beta decay   show
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Alpha particle -   show
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Beta particle -   show
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show A type of radioactive decay where a gamma ray is emitted  
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show A high energy photon  
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show The known decay rate of radioactive isotopes within the rocks  
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Which of the following types of radioactive decay does not result in a change in the number of protons and neutrons within a nucleus, but does release a lot of energy?   show
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show Alpha Decay  
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Which of the following is the term used for the process by which an unstable atomic nucleus loses energy by releasing radiation?   show
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show The time required for a quantity to fall to half of it's starting value  
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A scientist would not be able to use radiocarbon dating to find the age of which of the following samples?   show
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Which of the following terms is used to describe the process by which an unstable atomic nucleus loses energy by releasing radiation?   show
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show Half-life  
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show Uranium-238 decays to lead-206; uranium-235 decays to lead-207  
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Which of the following statements is true of radiocarbon dating?   show
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