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Just like the continents, the ocean floor has its own plains, valleys, mountains, and canyons. The size of them can be astounding. There are undersea mountain chains that run for miles, trenches deep enough to swallow up EarthÍs tallest peaks, and vast plains that seem to stretch to infinity. | QAI Publishing/UIG via Getty Images
Earth

$7 Million Xprize Competition Incentivizes Mapping of the World’s Oceans

Nineteen teams are competing for prize money and bragging rights over the best autonomous technology for surveying the vast, unknown areas of the ocean floor.