The correct statements about warm currents are:
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They are surface currents. Warm ocean currents typically occur in the upper layers of the ocean and are influenced by wind patterns and the Earth's rotation.
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They make landmasses warmer. Warm currents can raise the temperature of the coastal waters and influence the climate of adjacent landmasses, often leading to milder temperatures.
The other statements are incorrect:
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They are denser than cold currents. This is not true; cold water is generally denser than warm water.
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They move from the poles to the equator. This is incorrect; warm currents generally flow from the equator towards the poles.