chapter 8 the rock record
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Brianna_ennis on October 23, 2011
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17 terms
Terms | Definitions |
|---|---|
 fossil record | Provides information about the geological history of earth |
| relative age | The age of an object in relation to the ages of other objects. |
| Absolute age | The numeric age of an object or event. |
| Carbon 14 | 14c -combines with oxygen to form radioactive carbon dioxide |
| law of Superpostion | Principle that a sedimentary rock layer is older or younger. |
| Index fossils | A fossil thats used to esablish the age of a rock layer. |
| Law of crosscutting relationships | The principle that a fault or body of rock is younger than any other body of rock. |
| radioactive decay | A method of dertermining the age of an object by combining the relative percentages of a radioactive parent isotope and a stable isotope. |
| Parent isotope | original radioactive isotope |
| daughter isotope | newly formed isotopes |
| half- life | The time required for half of a sample of a radioactive isotope. |
| radiometric dating | a method of the absolute age of an object. |
| varve | a light colored band of coarse particles and a dark band of fine particles. |
| alpha decay | Alpha particle(2 protons, 2 neutrons) emited by a nucleus. |
| trace fossil | fossilized mark that formed om sedimentary rock by the movement of an animal or within soft sediment. |
| sedimentary rock | most fossils are discovered in this rock |
| an example of how half-lives work with a specific sample | if you had 10g , you would have 5g, then 2.5g. |
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