Its distribution is also limited to areas with high biological productivity, such as the polar oceans, and upwelling zones near the equator.

Then too, the island is situated in a polar ocean current, which lowers the local temperature to slightly below Terran normal.

Kelp forests occur worldwide throughout temperate and polar coastal oceans.

There was an unbroken tropical ocean and two unbroken polar oceans.

"We're in a native shelter, carved into a large outcropping of black rock, along the shore of the polar ocean."

"No." Uhura scrambled to her feet, then glanced out at the polar ocean.

Sea ice covers much of the polar oceans and forms by freezing of sea water.

The relationship, being highly dependent on growth conditions, was not found to hold everywhere in the polar oceans.

There are polar oceans, a few lakes and rivers.

The wreckage had obviously been carried across the polar ocean, perhaps across the pole itself.