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 Causes of the Great Depression: A Retrospective. By Kenneth Matziorinis. Introduction. During the 1930s the world experienced a cataclysmic economic collapse, the likes of which that had never been seen before. It was unlike previous. âdepressionsâ when economic activity would always recover following few years.