Pumice is a volcanic stone that can float on water.
Pumice and ash floating on Lake Nahuel Huapi, Bariloche, Argentina (1:23)
Dogs Gone Wild in Pumice (0:59)
Floating Dock on Wave (0:15)
The Dock (5:23 – watch from 2:16 to 3:00 only)
What Are Square Waves? | The 60-Second Explanation Video (1:00)
Scale model showing how mangrove forests protect the coast from wave erosion (0:12)
A rogue wave is an unpredictable surface wave that appears randomly in the ocean, but is not caused by an earthquake (like a tsunami).
Most extreme rogue wave ever was recorded off BC coast, report finds (2:15)
See Also