...crust. The opening through which the lava and tephra are emitted is called the volcanic vent. Lava is magma that reaches the Earth’s surface. Magma is melted rock at high pressure and temperature. Magma rises because it is initially less dense than the rock surrounding rock. It eventually equals the density of the surrounding rock and becomes a magma chamber. Tephra is pumice or ash that is blown into the air during eruptions. Volcanoes are generally found where tectonic plates converge and diverge; but are usually not created where tectonic plates slide past one another. As a result volcanoes can be found in all sorts of climate locations. There are four primary types of volcanoes which all have varying effects on the environment. This paper will explore these various types of volcanoes and show how they differ, as well as giving examples of eruptions for each of the types discussed. Principle Types of Volcanoes Cinder cones: Cinder cones are built from particles and blobs of congealed lava ejected from a single vent; they are the simplest forms of volcanoes. Gas charged lava is violently blown into the air and breaks up into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone. Most of these types of volcanoes have a bowl shaped crater at the summit and rarely rise more than a thousand feet or so above their surroundings. Lava flow can flow from a breach on the side of the crater or a vent from an outside flank. Lava...
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...interaction of the rigid lithosphere. Geomorphological hazard – an event causing harm to people or property, caused by Geomorphological processes e.g. plate tectonic movement. Francis Bacon 1620 As far back as 1620, Francis Bacon spotted that the west coast of Africa and the east coast of South America looked as if they would fit together, like pieces of a jigsaw puzzle. Between then and 1912 other people identified further similarities between other continental coastlines. Robert Mallet 1870s Robert Mallet was a nineteenth century scientist who managed to measure the speed at which earthquakes spread. Alfred Wegner 1911 While at Marburg, in the autumn of 1911, Wegener was browsing in the university library when he came across a scientific paper that listed fossils of identical plants and animals found on opposite sides of the Atlantic. Intrigued by this information, Wegener began to look for, and find, more cases of similar organisms separated by great oceans. Orthodox science at the time explained such cases by postulating that land bridges, now sunken, had once connected far-flung continents. But Wegener noticed the close fit between the coastlines of Africa and South America. Might the similarities among organisms be due, not to land bridges, but to the continents having been joined together at one time? As he later wrote: "A conviction of the fundamental soundness of the idea took root in my mind." Such an insight, to be accepted, would require large amounts of supporting evidence...
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...10000 quiz questions and answers www.cartiaz.ro 10000 general knowledge questions and answers 10000 general knowledge questions and answers www.cartiaz.ro No Questions Quiz 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Carl and the Passions changed band name to what How many rings on the Olympic flag What colour is vermilion a shade of King Zog ruled which country What colour is Spock's blood Where in your body is your patella Where can you find London bridge today What spirit is mixed with ginger beer in a Moscow mule Who was the first man in space What would you do with a Yashmak Who betrayed Jesus to the Romans Which animal lays eggs On television what was Flipper Who's band was The Quarrymen Which was the most successful Grand National horse Who starred as the Six Million Dollar Man In the song Waltzing Matilda - What is a Jumbuck Who was Dan Dare's greatest enemy in the Eagle What is Dick Grayson better known as What was given on the fourth day of Christmas What was Skippy ( on TV ) What does a funambulist do What is the name of Dennis the Menace's dog What are bactrians and dromedaries Who played The Fugitive Who was the King of Swing Who was the first man to fly across the channel Who starred as Rocky Balboa In which war was the charge of the Light Brigade Who invented the television Who would use a mashie niblick In the song who killed Cock Robin What do deciduous...
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