![DART® tsunami buoy on the ocean.](http://static.sciencelearn.org.nz/images/images/000/000/113/full/Tsunami-buoy20150806-30600-15cpni0.jpg?1674163719)
Waves transfer energy but not mass. Buoys like this DART® tsunami buoy are moved up and down by the waves that pass by them but don’t move directionally across the water.
Waves transfer energy but not mass. Buoys like this DART® tsunami buoy are moved up and down by the waves that pass by them but don’t move directionally across the water.