Why is it so hard to map the ocean floor? | The Economist // TRAIN BRAIN

Why is it so hard to map the ocean floor? | The Economist

Humans know more about the surface of Mars than Earth’s ocean floor. Only 27% of the seabed has been mapped—the rest is still an estimate. Why is the ocean floor so hard to chart?
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The Economist

On Tuesdays and Thursdays, The Economist posts videos that give authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them. We're also producing full films such as The Disrup...

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