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SCUOLA MEDIA VOLTA - BOLOGNA A. S. 2012-2013 Content and language integrated learning SUBJECT: CONTINENTAL DRIFT AND PLATE TECTONICS CLASS: 3°A – 3°C - 3° D – 3°H The Earth’s structure and plate movement The Earth has four main layers – the inner core, the outer core, the mantle and the crust. The inner core is 5,500°C - extremely hot. It is a very dense solid made from iron and nickel. The outer core is 2,000 km thick and is a liquid. The mantle is semi-molten and about 3,000 km thick. The crust is the rocky outer layer. It is thin compared to the other sections, approximately 5 to 70 km thick. The crust is made up of pieces called plates. There are two types of crust: oceanic and continental crust. The oceanic crust is found under the sea and is thinner and less dense than the continental crust. The Earth’s structure and plate movement Plate movement Heat from the core causes convection currents in the mantle. These currents slowly move the crust around. In some places the crust is destroyed. In other places new crust is formed. The Earth’s structure and plate movement Earthquakes and volcanoes are primarily found at plate boundaries. The plates are like giant rafts that slowly move around. Their movement is driven by convection currents in the mantle. The mantle is much hotter than the crust and its rock is molten. At the boundaries between plates, molten magma is able to force its way to the surface and escape as lava. The Earth’s structure Plate tectonics - Test Which is the correct order for the layers of the Earth? Inner mantle, outer mantle, core, outer core Crust, core, mantle, outer core Crust, mantle, outer core, inner core GLOSSARY – EARTH STRUCTURE Write in column B the right words from column C GLOSSARY – EARTH STRUCTURE Write in column B the right words from column C Column A English words layers compared to thick core plates thinner inner about extremely outer dense heat mantle plate movement molten crust convection currents forming around is able to slowly rafts to move surface plate boundaries to escape primarily Column B Italian words Column C Choice zolle nucleo estremamente fuso mantello denso sottile/spesso strati in confronto a crosta più sottile interno circa calore movimento delle zolle esterno muovere/muoversi lentamente margini delle zolle fuoriuscire correnti convettive formazione intorno principalmente superficie è in grado di zattere
