Iron-rich minerals are aligned parallel to Earth's magnetic field when they form during the cooling of magma.
(Iron-rich minerals; are aligned; parallel to Earth's magnetic field; T:when they form during the cooling of magma) (they; form; T:during the cooling of magma)
Iron-rich minerals they
are aligned form
parallel to Earth's magnetic field T:when they form during the cooling of magma
T:during the cooling of magma