The correct statements about warm currents are:
- They are surface currents.
- They make landmasses warmer.
The following statements are incorrect:
- They move from the poles to the equator. (Warm currents actually move from the equator towards the poles.)
- They are denser than cold currents. (Warm currents are less dense than cold currents.)
So, the accurate descriptions are that warm currents are surface currents and they make landmasses warmer.