Blank act like a large rivers in the earths oceans and spread earths heat and shape climates

Answer

Ocean currents

Explanation

Oceanic currents are the movement of sea water from one point to another.They can be caused by wind, differences in density of water masses , gravity or events of earthquakes.Ocean currents are measured in knots.Ocean currents can be surface currents or deep water currents.

answers.com says temperate reagions

c. 2,000 bce

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