1) Molten → rock material that occurs below Earth's surface.
2) Molten material both below and on top of the surface of a
From L. magma "dregs of an ointment," from Gk. magma "an ointment,"
from root of massein "to knead, mold."
Mâgma, loanword from Fr.
A large cavity within the Earth's → crust
containing → magma. When a
→ vent is opened to the surface,
magma is extruded onto the surface as → lava.
→ magma; → chamber.
© 2005-2020 by M. Heydari-Malayeri