But the limestone cave and other caves, caused by hydrogen gas that it came from deep below the Earth and rise to the surface, dissolved gases or erosion to the stone and created other caves.
The limestone caves and other cave caused by hydrogen gas comes from deep below the earth's surface and increase the gas dissolved or eroded away the rock and built more cave.
But limestone caves and cave other caused by hydrogen it from deep below the earth and add up to the surface dissolved gas or erosion to create other rocks and caves