Approximately ............. of the Earth's su | vedclass

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(A) The Earth's surface is covered by approximately $70 \%$ water,primarily in the form of oceans. Despite this vast area,the net primary productivity

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$70 \%, 55$ billion tons

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(A) The Earth's surface is covered by approximately $70 \%$ water,primarily in the form of oceans. Despite this vast area,the net primary productivity of the oceans is relatively low compared to terrestrial ecosystems. The total net primary productivity of the entire biosphere is approximately $170$ billion tons (dry weight) of organic matter. Out of this,the productivity of the oceans is only $55$ billion tons. Therefore,the correct statement is that $70 \%$ of the Earth's surface is covered by oceans,and their productivity is $55$ billion tons.

Approximately $.............$ of the Earth's surface is covered by oceans,yet the productivity of the oceans is only $...............$.

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