The Conversation

Explainer: how do you measure a sea's level, anyway?

Author: The Conversation

OK, but which sea's level? And how do you know what it is?Wally Gobetz, CC BY-NC-ND

There are about 330 million cubic miles of water in the world oceans today, 97% of all the water on the planet. Early in our planet’s 4.5 billion year history, water from the atmosphere and from the interior of the Earth gradually collected in the low areas on...

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