Mysterious shapes on ocean floors discovered

Scientists use technology to make incredible discovery

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Scientists have used echo-sounding methods to study the ocean floors in the Arctic and Antarctic.

See also: Remains of mystery sea creature found on Welsh beach

See also: 'Walking shark' discovered on ocean floor

Their research shows how the ocean floors were scraped by ice sheets and glaciers.

18 weird natural phenomena around the world

18 weird natural phenomena around the world