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.
What were the Four Causes of the Great Depression. High demands for consumer goods and agricultural products led to overpopulation. Buying on credit increased personal debt. Buying on margin was a risky market practice--. Bank loans for stock purchases was an unsound practice. The Smoot-Hawley Tariff created trade war worsened world economic conditions.