The correct responses about warm currents are:
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They make landmasses warmer. - Warm currents generally warm the coastal regions they flow past.
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They are surface currents. - Warm currents are primarily surface currents that flow in the upper layer of the ocean.
The statements "They move from the poles to the equator" and "They are denser than cold currents" are incorrect. Warm currents typically flow from the equator toward the poles, and warm water is less dense than cold water.