Igneous rocks form when rocks are heated to the melting point which forms magma.
(Igneous rocks; form; T:when rocks are heated to the melting point) (rocks; are; heated to the melting point) (the melting point; forms; magma)
Igneous rocks rocks the melting point
form are forms
T:when rocks are heated to the melting point
heated to the melting point
magma