Unit 3 Lesson 1,2,3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Uniformitarianism | a principle states that geologic processes that occurred in the past can be explained by current geologic processes
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| climate | the weather conditions in an area over a long period of time
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| fossil | are the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
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| ice core | a long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates
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| trace fossil | a fossilized structure that formed in sedimentary rock by animal activity on or in soft sediment
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| relative dating | any method of determining whether an event or object is older or younger than other events or objects
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| superposition | a principle that states that younger rocks lie above older rocks
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| geologic column | an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom
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| unconformity | a break in the geologic record created when rock layers are eroded or when sediment is not despoited for a long period of time
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| absolute dating | any method of measuring the age of an event or object in years
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| radiometric dating | a method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope
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| radioactive decay | the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
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| half-life | the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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