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ET Related
| Question | Answer |
|---|---|
| which of the following is typically measured in hundreds of the thousands to millions of years? | Epoch |
| what type of event most commonly marks the boundaries between different geological periods | mass extinctions |
| uranium 235 with a half life of 704 million years to case to form lead-207 If the ratio of uranium-235 to pb-207 in a rock sample was 123 how old is a sample of Rock? | 1.4 billion years |
| which series shows the divisions of geological time arranged in order from longest to shortest? | Eon, Era, Period , Epoch |
| iridium is an element that is common in meteors but is very rare on Earth iridium layer that is 65.5 million years old has been discovered in rock layers in many different locations all around the world. For which of these following hypotheses does this d | an impact event caused the mass extinction that marks the end of the Cretaceous Period . |
| why does the hadean Eon not technically considered a geologic time period ? | the Earth was in a molten State during the hadean Eon. |
| the average rate of Extinction prior to the existence of humans was about 10 to 100 species per year. Scientists estimate that over 27,000 species are currently going extinct each year from tropical forest and destruction alone. This is composed by destru | A mass extinction that may one day Mark the end of the quaternary period. |
| a student states that divisions of geologic time are defined by specific amount of time so that each Eon represents the same amount of time each Arrow represents the same amount of time Etc. What is wrong with this statement? | the divisions of geological time are separated by significant events in Earth's history not periods of time |
| which of the following is not a division of geologic time? | Generations |
| which of the following could be an example of evidence that could be used to construct the geological time scale? a geologic event, index fossils, radiometric dating | a geologic event, index fossils, radiometric dating |
| compare Rock layers in each locality | 1, 3, 2 |
| which of the following is not a Precambrian eon? | Phanerozoic |
| which of the following is used as evidence to construct the geological time scale? | fossils, radiometric data, comparative studies of different Rock sequences |
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kaiaphillips
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