00:00A volcano may appear quiet for years, but deep beneath the surface a hidden system is constantly changing.
00:07Beneath many volcanoes lies a magma chamber filled with molten rock and gas, which feeds new material from below.
00:15waits.
00:15When fresh magma flows into the chamber, it becomes narrow and the pressure on the surrounding rock begins to increase.
00:21climb.
00:21The surrounding rock acts like a shell, but with increasing pressure, faint cracks begin to appear inside the mountain.
00:28expand.
00:29Magma follows these cracks upwards, moving like a glowing liquid in a hidden pipe through the main chimney.
00:36As it approaches the surface, the pressure decreases and the gas in the magma expands, causing the rising air to rise.
00:42liquid becomes even more powerful.
00:44When the pressure is finally released, ash and lava erupt, proving that eruptions are the result of complex forces that
00:52interact beneath the surface.
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