Low frequency sound energy is used to probe beneath the sea floor and to measure temperatures and currents in the water column.
(Low frequency sound energy; is used; to probe beneath the sea floor and to measure temperatures and currents in the water column) (Low frequency sound energy; to probe; L:beneath the sea floor)
Low frequency sound energy Low frequency sound energy
is used to probe
to probe beneath the sea floor and to measure temperatures and currents in the water column
L:beneath the sea floor