What are the introduction and the exposition of The Cay?

"The Cay" is a novel by Theodore Taylor that follows the story of a young boy named Phillip who becomes stranded on a deserted island with an elderly West Indian man named Timothy after a shipwreck. The introduction sets the scene for the story by describing the circumstances of the shipwreck, while the exposition focuses on Phillip and Timothy's struggle to survive and adapt to their new surroundings on the island.