Question: What is the main difference between a groin and a jetty? a ) Groins are perpendicular to the shoreline, while jetties are parallel b )

What is the main difference between a groin and a jetty?
a) Groins are perpendicular to the shoreline, while jetties are parallel
b) Groins are built to trap sediment, while jetties are built to protect harbors
c) Groins are submerged structures, while jetties are above the waterline
d) Groins are made of concrete, while jetties are made of rock

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