the.com/magma chamber
Earth's slow cooker, simmering for millennia until it decides to flambé a city.
means A underground reservoir of molten rock beneath a volcano, where magma pools and pressurizes before an eruption sends it upward.
from Magma traces to Greek 'magma,' meaning a thick paste or unguent — related to 'massein,' to knead — originally used for ointments and dough before geologists in the 19th century borrowed the word for molten rock, likening its sticky, viscous flow to something kneaded or smeared. 'Chamber' comes from Latin 'camera,' meaning a vaulted room, via French — the same root that gives us the camera obscura's 'chamber' for trapping light. Put together, the compound is a 19th/20th-century geological coinage: a kneaded, pasty substance sitting in its vaulted room, waiting.
- location
- underground reservoir of molten rock beneath volcanoes
- misconception
- not a hollow cave, more like a mushy crystal sponge
- pressure buildup
- gas bubbles trapped inside trigger the eventual eruption
- size record
- Yellowstone's chamber could fill the Grand Canyon fourteen times