Unlike regular beach sand that has a round grain due to the erosion caused by tides, the sand used for sand sculptures has an angular grain.
(regular beach sand; has; a round grain) (the erosion; caused; by tides) (the sand; used; for sand sculptures) (the sand used for sand sculptures; has; an angular grain)
regular beach sand the erosion the sand the sand used for sand sculptures
has caused used has
a round grain
by tides
for sand sculptures
an angular grain