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SEOmoz has the answers to to these 10 questions:

1. What four search engines comprise 90%+ of all general (non site-specific) web search traffic?
2. Explain the concept - “the long tail of search.”
3. Name the three most important elements in the head section of an HTML document that are employed by search engines.
4. How do search engines treat content inside an IFrame?
5. What resource and query can you use to determine which pages link to any page on SEOmoz.org and contain the words “monkey” and “turnip”?
6. What action does Google threaten against websites that sell links without the use of “nofollow”?
7. What is the difference between local link popularity and global link popularity?
8. Why is Alexa an inaccurate way to estimate the traffic to a given website?
9. Name four types of queries for which Google provides “instant answers” or “onebox results” ahead of the standard web results.
10.  Describe why a flat site architecture is typically more advantageous for search engine rankings than a deep site architecture.