Abdominal pain. Find possible causes of abdominal pain based on specific factors. Check one or more factors on this page that apply to your symptom. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Magma in Earth's Mantle Forms Deeper Than Once Thought. Study simulating pressures in mantle beneath the ocean floor shows that rocks can melt at depths up to 250 kilometers. When magma reaches Earth's surface and erupts from a volcano, it becomes lava.
How do cavern and cave diving. Cavern diving is the exploration of permanent, naturally occurring overhead environments while remaining within sight of their entrances. It differs from cave diving in that, while cave divers may penetrate thousands of yards, cavern divers generally go no further than 130 feet from the surface.