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.
Quick Answer. The stock market crash of 1929 and the subsequent financial panic that followed marked the beginning of the Great Depression. The stock market crash caused consumers to panic and banks to fail. Keep Learning.