What makes a "clap" in a rainstorm?

Which civil rights group, founded in 1942, shares its acronym with the part of an apple where the seeds are? A civil war known as the War of a Thousand Days broke out in which South American country in 1899? Which leader of civil disobedience had the middle name Karamchand? What is a legal claim upon property to secure payment of a debt? A clapperboard is used to synchronize film with what? A classic 1900 book describes which dog: "He was not gray; he was a little black dog, with long silky hair"? A classic 1936 book about the literary peak of Boston and Concord was called "The Flowering of..." what? Complete the title of the classic 1955 children's book by Crockett Johnson: "Harold and the ___ Crayon".