They also perform tests to determine whether the objects roll or stack and float or sink, as well as whether they are attracted to a magnet.
(They; also perform; tests to determine whether the objects roll or stack and float or sink, as well as whether they are attracted to a magnet) (they; are attracted; to a magnet)
They they
also perform are attracted
tests to determine whether the objects roll or stack and float or sink, as well as whether they are attracted to a magnet
to a magnet