The Mohole was abandoned as seemingly impossible: no ocean drill had ever got below 2km. Topics Earthquakes Opinion. It was the first evidence that the Earth had a crust, above a mantle that extended for nearly 3,km to the planet's metal core. Challenger discovered that, beneath its scaly mineral carapace, the planet was a living thing, which reacted violently to the insult. It could hardly be more important to us.
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