The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc. (noun)
A basic algebraic structure consisting of a set equipped with a single binary operation. (noun)
Examples of word magma
There were countless miles of lava tunnels there, left by retreating magma from a time when the Moon was a burning young rock.
Pockets of hot molten rock called magma collect beneath the surface of the Earth.
And then this tremor that everybody's talking about, it lasted for about 50 minutes, meaning that the lava or the magma, which is lava that's below the surface, is actually making its way up towards the surface.
Now scientist first thought magma, which is lava that hasn't yet made it to the ground wasn't moving to the surface.
The resultant body of molten liquid, called magma, will solidify to produce the igneous rock, granite, but if it is still in liquid form as it approaches the surface, lava results.