Top of Volcano Blown of in Blast! Essay Example For Students

Top of Volcano Blown of in Blast! Essay Top of Volcano Blown Off In Blast! 18/04/82 60 people were killed today when Mt. St Helens blew its top Mt. St Helens erupted two years ago today in a blast that caused the volcano to be reduced by 451 metres (1313 feet). The volcano is south-western Washington and is part of the Cascade Range. Mt. We will write a custom essay on Top of Volcano Blown of in Blast! specifically for you for only $16.38 $13.9/page Order now St Helens had been dormant since 1859 and has let off its first blast since then today. The volcano killed all life in an area of 180 sq. cm(70 sq. miles) including at least 60 people! The ash and dust spread much farther than this, of course. Today it is continuing to emit to emit dust and ash at intervals. Today a monument has been erected called the National Volcano Monument, in memory of this tragedy. How A Volcano is Formed A volcano is formed in this way: 1)Magma starts off below the crust. 2)Magma collects in chamber. 3) Pressure rises. 4) The pressure rises so high that the magma breaks through the crust and volcano erupts. Often volcanoes are cone shaped. You might ask: How do they get like that? This is the answer: When a volcano erupts many minerals and fragments are blown up, many falling in a circle around the volcano. As lava flows onto this it builds up around the volcano, so the volcano gets higher still. Each time the volcano erupts, more lava, minerals and fragments are emitted. Therefore every time a volcano erupts it erupts it gets taller, and some like Mt. St. Helens have even become tall enough to be classed a mountain. NB: This article originally contained pictures, elongating it and making it better presented. Aron Cohen,1991 Category: History .

b. f. skinner essays

b. f. skinner essays B.F. Skinner born in Susquehanna, Pennsylvania March 20, 1904 was a man known as B.F. Skinner. His real name was Burrhus Fredric, but he signed his name as B.F. since he was at the tender age of nine Skinner accomplished many things in his lifetime. He wrote several books, all about psychology Skinner was the first child of William A. and Grace Burrhus Skinner . During high school Skinner was involved in many activities, including writing for the local paper, playing the piano and saxophone, and inventing things. After graduating high school Skinner went to Hamilton College and graduated in 1926 where he majored in English language and literature. There after he went on to Harvard University, where he received a Ph.D. degree in 1931. Skinner stayed there until 1936 doing laboratory experiments . He the joined the University of Minnesota in 1937. It was during this time that Skinner wrote his first book The Behavior of Organisms .The book was quoted to be a fairly comprehensive s tudy of operant conditioning In this book the theory of B.F. Skinner is based upon the idea that learning is a function of change in overt behavior. Changes in behavior are the result of an individuals response to events (stimuli) that occur in the environment. A response produces a consequence such as defining a word, hitting a ball, or solving a math problem. When a particular Stimulus-Response (S-R) pattern is reinforced (rewarded), the individual is conditioned to respond. The distinctive characteristic of operant conditioning relative to previous forms of behaviorism (for example Thorndike and Hull) is that the organism can emit responses instead of only eliciting response due to an external stimulus. Reinforcement is the key element in Skinners S-R theory. It could be verbal praise, a good grade, or a feeling of increased accomplishment or satisfaction. The theo ...