Key differences, features, and comparative analysis of Quantity and Value.
| Quantity | Value |
|---|---|
| Annual NPP of the whole biosphere | ~170 billion tons (dry weight) of organic matter |
| Annual NPP of the oceans | only 55 billion tons |
| Annual NPP of land | The rest — ~115 billion tons |
| Fraction of Earth's surface covered by oceans | ~70 per cent |
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