This raft is made of rocks!

A huge raft of pumice over 20,000 football fields in size was probably the result of an underwater volcanic eruption near Tonga. (NASA)
This sailboat ended up plowing right through the milkshake-like sea of floating pumice. (Sail Surf ROAM/Facebook)
Sailor Michael Hoult with pumice he pulled from the sea after sailing through a vast raft of the sponge-like rock. (Sail Surf ROAM/Facebook)
A close up photo shows the sponge-like look of pumice.
The violent meeting of melted rock and cold water causes all sorts of interesting results, from frothy pumice to pillow-shaped boulders and lava glass. (RB)

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How can rocks bob in the ocean? They are full of holes!

A volcano is under the sea. It shot out hot lava. The lava turned into pumice [puh-mess].

Pumice is like sponge made of rock. A big clump of floating pumice is called a raft.

READ MORE: Ocean currents are pushing a “raft” of pumice toward Australia’s Great Barrier Reef. Tiny holes in the pumice hold sea creatures. Scientists are worried about Australia’s coral. Will those creatures end up in the Great Barrier Reef? Will they be good for it? Scientists hope so. Jesus has charge of the ocean and all that is in it. Matthew 8:27 tells us that the disciples asked, “What sort of man is this, that even winds and sea obey Him?”