Oceanography
posted by bj .
What substrate indicates the youngest and oldest beach?
What are coral's symbionts?

1. Try some of the following links for information:
https://www.google.com/search?q=What+substrate+indicates+the+youngest+and+oldest+beach%3F+&ie=utf8&oe=utf8&aq=t&rls=org.mozilla:enUS:official&client=firefoxa
2. Try some of these:
https://www.google.com/search?q=What+are+coral%27s+symbionts%3F+&ie=utf8&oe=utf8&aq=t&rls=org.mozilla:enUS:official&client=firefoxa
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