The value of solar energy or extraterrestrial light reaching the biosphere is

  • A
    $2 \,g \,cal/cm^2/min$
  • B
    $30 \,g \,cal/cm^2/min$
  • C
    $1 \,g \,cal/cm^2/min$
  • D
    $10 \,g \,cal/cm^2/min$

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