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what is uniformitarianism?
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who first stated this principle?
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| Question | Answer |
|---|---|
| what is uniformitarianism? | the principle that processes that occurred in earth's past can be explained by current geological processes. |
| who first stated this principle? | james hutton |
| how old is the earth as we know? | 4.6 billion years |
| what is relative age? | the age of an object in relation to the ages of other objects. |
| rock can form in layers, called ______, that show the sequence of events that took place in the past. | strata |
| most commonly studied in | sedimentary rock |
| the law of ____________ states that the layer on the bottom is older than the layer above it. | superposition |
| the law of _________________ states that the an igneous intrusion or a fault is always younger than the rock layers it cuts through. | crosscutting relationships |
| what is absolute age? | the numeric age |
| a method used to determine absolute age by comparing the relative percentages of a radioactive isotope to a state isotope | Radiometric dating |
| uranium 238 has a half life of what? | 4.5 billion years |
| younger rock layers can be indirectly dated by using carbon 14 dating to analyze the organic material (wood, bones, shells) embedded in the rock layer. | carbon dating |
| tracks, burrows, borings are examples of what? | trace fossils |
| how fast do you have to protect or burried dead organism | quickly |
| how is evolution related to geologic change? | by using geologic change they can determine environmental change or evolution. |
| what are two characteristics of most Precambrian rocks. | deformed and rare fossils |
| why are fossils rare in Precambrian rocks. | they are extremely old |
| describe one life-form from each of the six periods of the Paleozoic Era. | marine life-forms, vertebrates, Euripides, rhipidistians |
| why is the Devonian Period is commonly called the Age of Fishes. | most fossils of that time were fish fossils |
| list the kinds of life-forms that became extinct during the mass extinction at the end of the Permian Period. | |
| list the periods of the Mesozoic Era, and describe one major life-form in each period. | |
| identify two major geologic and two major biological developments of the Mesozoic Era. | |
| list the periods and epochs of the Cenozoic Era, and describe one major life-form in each division. | |
| identify two major geologic and two major biological developments of the Cenozoic Era. | |
| how the ice ages affected animal life during the Cenozoic Era. | |
| the era, period, and epoch we are in today. | |
| the worldwide environmental changes that set the stage for the Age of Mammals. |
Created by:
johnrangel
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