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 Stock Market Crash. The most noted cause of the Great Depression is the stock market crash on Black Tuesday, October 29, 1929. Americans lost $14 billion dollars on that one day alone and more than $40 billion in the following months. This is despite millions of dollars being pumped into he market to stabilize it.