the.com/magmatism
Earth's way of admitting it's still molten on the inside.
means The geological processes by which molten rock forms, moves, and eventually crystallizes beneath or upon the Earth's surface.
from Built from 'magma,' which Greek speakers used for any thick paste or ointment — from 'massein,' to knead. Geologists borrowed the word in the 1800s for the Earth's kneaded, doughy interior rock, and tacked on the '-ism' suffix to name the whole restless process: the rising, cooling, and hardening of that molten material into stone.
- definition
- generation and movement of magma within or onto crust
- two flavors
- intrusive cools underground, extrusive erupts as lava
- driver
- mantle melting from decompression, heat, or added volatiles
- planetary clue
- active magmatism signals a geologically alive world