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William Ray Duan
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BIOGRAPHY

Student at Irvington High School, Fremont, California.

Primary Contributions (1)
biological soil crust; Death Valley National Park
Biological soil crust, thin layer of living material formed in the uppermost millimetres of soil where soil particles are aggregated by a community of highly specialized organisms. Biological soil crusts are found primarily in open spaces in the dry and extremely cold regions of all continents,…
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