Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
section 8 and 9
review
| 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
Popular Earth Science sets