When using radiometric dating to determine the absolute age of a rock, which quantities does a geologist compare in a sample? A geologist analyzes the amount of potassium in a rock and determines that 25 percent of the original potassium is still present. Assuming no potassium has been lost to any process other than radioactive decay, what is the approximate absolute age of the rock? Carbon and carbon are both found in living organisms. What is the difference between carbon and carbon?
The boundaries between various periods on the geologic time scale are based primarily on:.
What property of index fossils makes them so useful for subdividing geologic time? What features of rock strata would be most useful for a geologist to analyze in order to correlate rock layers in two different locations? How does the principle of faunal succession allow geologists to correlate rock strata in different geographic locations? An igneous rock intrudes into three tilted layers of sedimentary rock.
Which set of relative dating methods is most useful to determine the chronological order of formation of the rocks? The photograph shows a sedimentary layer overlying metamorphic rocks. How is the boundary between the two formations best described? Quora launched a full-text search of questions and answers on its website on March 20, ,  and extended the feature to mobile devices in late May Quora acquired the online community website Parlio in March In October , Quora launched a Spanish version of its website to the public.
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After question details were removed in August , Quora was highly criticized for doing so. According to some users, the removal of question details limited the ability to submit personal questions and other questions requiring question details. As of February 28, , according to Alexa Internet , the United States makes up the largest user base at From Wikipedia, the free encyclopedia. For the legislature term, see Quorum.
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