The linked sites below, although from two completely different authors, share an enchantment with The Galapagos Islands.  First click on Galapagos Archipelago by Charles Darwin.  Make a bookmark for this site.  Then click on The Encantadas (Enchanted Isles) by Herman Melville.  Make a book mark for this site also so you can go back and forth between the two sites for a close reading of each.  Read each carefully.  Then write a well organized essay that analyzes how the distinctive style of each passage reveals the purpose of its writer.