It has been calculated that about 0.1 percent of solar radiation is fixed in the biosphere by photosynthesis.
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Q101: The interrelated web of cycles in the
Q102: The main source of free nitrogen is
Q103: Water in the biosphere is a closed
Q104: Most plants are able to use nitrogen
Q105: Action by microorganisms creates fixed nitrogen.
Q107: Water is the source of hydrogen for
Q108: The burning of fossil fuels represents a
Q109: Geographers are keen users of the Linnaean
Q110: The biosphere contains more than a half
Q111: The biotic nutrients are finite and limited
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