Rock & Fossil Record
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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principle that states that geological process shaping the Earth today have been at work throughout Earth's history | uniformitarianism
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principle that states that all geological change occur suddenly | catastrophism
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paleontology | the science involved with the study of past life
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relative dating | determining whether an object or event is older or younger than other objects or events
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geologic column | an ideal sequence of rock layers that contain all the known fossils and rock formations on earth, arranged from oldest to youngest
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absolute dating | the process of establishing the age of an object by determining the number of years it has existed
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isotope | atoms of the same element that have the same number of protons but have different numbers of neutrons
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radioactive decay | isotopes tend to break down into stable isotopes of the same or other elements
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half-life | the time needed for half of a sample of a radioactive substance to undergo radioactive decay
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fossil | remains or physical evidence of an organism preserved by geologic process
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petrifaction | process in which minerals replace on organisms tissue
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trace fossil | fossilized mark that is formed in soft sediment by the movement of an animal
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mold | a mark or cavity made in a sedimentary surface by a shell or other body
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cast | a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
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index fossil | a fossil that is found in the rock layers of only one geological age and that is used to establish the age of the rock layers
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geologic time scale | standard method used to divide the Earth's long natural history into manageable ports
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eon | largest division of geologic time
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era | unit of geologic time that includes two or more periods
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periods | unit of geologic time into which eras are divided
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extinction | the death of every member of a species
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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.
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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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Created by:
halerz
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