Electromagnetic fields are found naturally in the environment, such as in lightning and in the Earth's magnetic field, which causes a compass needle to point north.
(Electromagnetic fields; are found naturally; L:in the environment) (the Earth's magnetic field; causes; a compass needle to point north) Context(the Earth 's magnetic field causes,List([91, 131))):(a compass needle; to point; north)
the Earth 's magnetic field causes,List([91, 131))
Electromagnetic fields the Earth's magnetic field a compass needle
are found naturally causes to point
L:in the environment
a compass needle to point north
north