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.
The recovery from the Great Depression was spurred largely by the abandonment of the gold standard and the ensuing monetary expansion. The economic impact of the Great Depression was enormous, including both extreme human suffering and profound changes in economic policy. Timing and severity. The Great Depression began in the United States as an ordinary recession in the summer of 1929.