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Tectonics plates trabajo de sergio gutierrez fernandez
 

Tectonics plates trabajo de sergio gutierrez fernandez

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    Tectonics plates trabajo de sergio gutierrez fernandez Tectonics plates trabajo de sergio gutierrez fernandez Presentation Transcript

    • -It is measured on the Richter scale: each point is actually ten times greater than the one below it. That means an earthquake which registers 6 on the scale is ten times greater than one measuring 5, and one hundred times greater than one measuring 4.
    • Volcanoes form where:
    • Where do volcanoes occur?
    • Types of Crust
    • Plates: They float, like rafts, on the molten (semi-solid) mantle
    • -It is when oceanic crust moves towards continental crust, for example the Nazca Plate moving towards the South American Plate. -As the oceanic crust is heavier it is forced downwards. As it is forced, downwards pressure increases which can trigger extremely violent earthquakes. At the same time the heat produced by friction turns the descending crust back into liquid rock called magma. The hot magma tries to rise to the surface. Where it succeeds there will be violent volcanic eruptions.
    • Constructive Margins
    • Measures to reduce the effects of tsunamis are usually in two parts: 1-Predict where and when the event might happen. 2-Prepare local people and emergency services for the disaster should it occur. Why are there volcanic eruptions in Philippines?
    • Why live in a danger zone? -Good soil: Volcanic rocks break down to form some of the most fertile soils on Earth -Tourism: To watch eruptions, geysers, sand baths… -Geothermal energy: Heat from the Earth can be used to generate electricity -Valuable raw materials: Gold, silver, copper and other useful minerals are found in the remains of extinct volcanoes