another thing that floats
- Mount Dickerman (Wikipedia)
Mount Dickerman, or Dickerman Mountain, is a mountain in Mount Baker-Snoqualmie National Forest in Washington state. It is located northwest of Barlow Pass along the Mountain Loop Highway. A strenuous four mile trail leads from this highway to the summit with views which includes Glacier Peak, Monte Cristo Peak, and Sloan Peak.
- Lava balloon (Wikipedia)
A lava balloon is a gas-filled bubble of lava that floats on the sea surface. It can be up to several metres in size. When it emerges from the sea, it is usually hot and often steaming. After floating for some time it fills with water and sinks again.