- This sonar image, taken aboard
the USS Hawkbill nuclear submarine during the Navy’s SCICEX
mission in 1999, show a series of parallel grooves, or flutes,
carved in the Arctic sea floor. Ohio State University Research
Scientist Leonid Polyak and his colleagues believe the grooves
may have been caused by the movement of giant Arctic ice sheets
as early as 1.5 million years ago. By understanding the formation
and demise of these ancient ice sheets, scientists hope to learn
about how Earth’s changing climate will affect today’s
Antarctic ice sheets.
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