For many of the world's beaches, science has determined that offshore sand (beyond closure depth) has been the primary natural source of sand for beaches.
(science; has determined; that offshore sand (beyond closure depth) has been the primary natural source of sand for beaches) Context(science has determined,List([33, 55))):(offshore sand; has been; the primary natural source of sand for beaches)
science has determined,List([33, 55))
science offshore sand
has determined has been
that offshore sand (beyond closure depth) has been the primary natural source of sand for beaches
the primary natural source of sand for beaches