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.
Janeisa Gonzalez, Lauren Lewicki, Liana Patoine. How did the Great Depression Start? The most comprehensive answer to the question of what caused the Great Depression is that conditions by the last year of the 1920s were quite the opposite of these optimistic pronouncements.