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.
Wall Street Crash (October 1929) The Wall Street Crash was the U.S. Stock Market crash of October 29, 1929, which precipitated a world-wide collapse of share values and triggered the Great Depression â 10 years of economic slump with catastrophic levels of unemployment across all the industrialised countries apart from the Soviet Union.