Earth's magnetosphere is an extension into space of the familiar magnetic field that causes compass needles to point North.
(Earth's magnetosphere; is; an extension into space of the familiar magnetic field) (the familiar magnetic field; causes; compass needles to point North) Context(the familiar magnetic field causes,List([52, 91))):(compass needles; to point; North)
the familiar magnetic field causes,List([52, 91))
Earth's magnetosphere the familiar magnetic field compass needles
is causes to point
an extension into space of the familiar magnetic field
compass needles to point North
North