When the level of lava in the lake falls below the water table, rock and debris from the crater walls collapse and create a blockage in the lava tube leading up to the crater.
Rock and debris from the crater walls collapse and create a blockage in the lava tube leading up to the crater. When the level of lava in the lake falls below the water table.
When the level of lava in the lake falls below the water table. Rock and debris from the crater walls collapse and create a blockage in the lava tube leading up to the crater.
When the level of lava in the lake falls below the water table. Rock and debris from the crater walls collapse and create a blockage in the lava tube leading up to the crater.