Pumice

Pumice holds water and works great as a mulch in farming.

photo by sally king

The Rock
Pumice is a very light, porous rock that is formed from gas-filled magma during some volcanic eruptions. Because it is porous, it absorbs and holds water. Pumice covers some areas of the park.

The Uses
Areas of soil covered with pumice were good for growing crops because pumice holds moisture.