Magma is molten rock within the Earth's crust

Magma is rock within the earth that is completely melted. This happens between 800 and 1300° C, depending on the pressure and the rock's composition.

Source: Earle, S (2015) Physical Geology#Chapter 3 Intrusive Igneous rocks

See: Lava is magma that has emerged onto the Earth's surface for the difference between magma and lava

See: 1.1c magma is formed at three plate tectonic settings for places where magma is formed

See: The composition of magma ranges from ultramafic to felsic for the various different types of magma