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 Great Depression (1929-39) was the deepest and longest-lasting economic downturn in the history of the Western industrialized world.In the United States, the Great Depression began soon after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors.he Great Depression (1929-39) was the deepest and longest-lasting economic downturn in the history of the Western industrialized world.