Relative dating quiz questions

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:.

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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, , [12] 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.

Section 2: Relative-Age Dating of Rocks

In September , Quora reported hitting million monthly users. In December , Quora announced that approximately million user accounts were affected by a data breach. Quora requires users to register with the complete form of their real names rather than an Internet pseudonym screen name ; [36] although verification of names is not required, false names can be reported by the community.

This was done with the ostensible intent of adding credibility to answers. Users with a certain amount of activity on the website have the option to write their answers anonymously but not by default.

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Visitors unwilling to log in or use cookies have had to resort to workarounds to use the site. They can upvote or downvote answers and suggest edits to extant answers provided by other users. Quora allows users to create user profiles with visible real names, photos, site use statistics, etc.

In August blogger Ivan Kirigin pointed out that acquaintances and followers could see his activity, including which questions he had looked at. Users can disable this feature. Quora has developed its own proprietary algorithm to rank answers, which works similarly to Google 's PageRank.

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Currently, Quora has different ways to recommend questions to users: Quora supports various features to moderate content posted by users. The majority of content moderation is done by the users, though staff can also intervene. In November , Quora introduced the Top Writers Program as a way to recognize individuals who had made especially valuable content contributions to the site and encourage them to continue.

About writers each year are chosen out of million monthly unique visitors. This has inspired both young and experienced writers. Top writers are invited to occasional events and receive gifts such as branded clothing items and books. The company believes that by cultivating a group of core users who are particularly invested in the site, the program creates a feedback loop of user engagement. Quora World Meetup started in as a tradition to Quora readers and writers to come know themselves, network and have fun.

Quora World Meetups are organised by group of Quora contributors with a designated lead and as a contribution from Quora they usually send branded swags, stickers to the attendees.

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According to Quora, they defined the World Meetups as "This is our way of celebrating the global growth of Quora, and all of the readers and writers who have made it possible. The last meetup had nearly 3, writers from over cities and the World Meetups will come up from June All other information about the Meetups can be found on The Quora Blog.

Quora was reviewed extensively by the media in In , Quora attracted controversy for using robots. Critics have raised concerns about the fate of Quora's data if the site ever goes offline and recommended Stack Overflow as an easily archived alternative.


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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.

Retrieved 1 October Retrieved February 12, Retrieved April 6, Retrieved March 29, Retrieved January 24, Retrieved February 1, Retrieved November 14, Retrieved May 11, Retrieved April 11, It Was Almost Free".

Radiometric dating

Retrieved May 12, Retrieved March 31, Retrieved August 7, Retrieved October 21, Retrieved September 23, Retrieved December 5, The New York Times. Retrieved 15 February Retrieved 31 July Retrieved 31 May Archived from the original on 11 January Retrieved 21 October Retrieved 6 April The Globe and Mail. Retrieved 20 October