This mixture formed when slow-cooling magma was erupted from deep within the earth, accelerating its cooling process.
(This mixture; formed; T:when slow-cooling magma was erupted from deep within the earth, accelerating its cooling process) (slow-cooling magma; was erupted; )
This mixture slow-cooling magma
formed was erupted
T:when slow-cooling magma was erupted from deep within the earth, accelerating its cooling process