The average depth of the oceans is about $4 \mathrm{km}$ and oceans cover about $70 \%$ of Earth's surface. Make an order-of-magnitude estimate of the volume of water in the oceans. Do not look up any data in books. (Use your ingenuity to estimate the radius or circumference of Earth.)
Added by Diego H.
Step 1
First, we need to estimate the radius of the Earth. We know that the Earth is not a perfect sphere, but for the purpose of this estimation, we can consider it as such. We also know that the Earth's circumference is approximately 40,000 km (this is the basis for Show more…
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