magma

Definition

The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc.

Etymology

Etymology tree Proto-Indo-European *mh₂ǵyéti Ancient Greek μάσσω (mássō) Proto-Indo-European *-mn̥ Ancient Greek -μα (-ma) Ancient Greek μάγμα (mágma)der. English magma From Ancient Greek μάγμα (mágma, “paste”).

Example Sentences

• "By the pathside, there are occasional large boulders that shown black crystals the size of a fingernail; these are pyroxene minerals that had time to crystallise out deep within the chamber of liquid rock – or magma – beneath the volcano."