When Jane visits a beach, she notices a sea stack has formed offshore. Which of the following best describes what caused the sea stack to form? a)Erosion hollowed out the rock in a seaside cliff.
b) Deposition moved sand from the beach into an offshore pile.
c) A large number of shells were carried out to sea by the waves.
d) A rocky section of the beach was eroded by the sea, leaving behind a protruding rock formation surrounded by water.