Cnidaria is a phylum within Kingdom Animalia which consists of hydras, jellies (or jellyfish), sea anemones, and corals. All cnidarians are radially symmetrical, and there are two main radially symmetrical body types.
The stock market crash, on black Tuesday (October 29, 1929) began the Great Depression.
More Information on the Great Depression: The beginning ofAmerica's Great Depression is often cited as the dramatic crash of the stock market on Black Thursday, October 24, 1929 when 16 million shares of stock were quickly sold by panicking investors who had lost faith in the American economy.