Geologic Time
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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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