Answer:
Figurative language: "The glittering sea rose up, moved apart in planes of blatant impossibility; the coral reef and the few stunted palms that clung to the more elevated parts would float up into the sky, would quiver, be plucked apart, run like raindrops on a wire or be repeated as in an odd succession of mirrors." This sentence contains several examples of figurative language, including personification and simile.
Simile: "Then, at the crest, sat a child, filthy, not much smaller than himself, and silent as he watched Ralph’s green-and-white-and-yellow body enviously." This sentence contains a simile, which is a comparison using the words "like" or "as." In this case, the child is being compared to Ralph's body "enviously."
Metaphor: "The rock was as large as a small motor car." This sentence contains a metaphor, which is a comparison without using "like" or "as." In this case, the size of the rock is being compared to the size of a small motor car.
Personification: "The sun in his eyes reminded him how time was passing, so he got up and went on." This sentence contains an example of personification, as the sun is being described as if it were a person that is causing the boy to remember that time is passing.
hope this helps! :)