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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 PLATE TECTONICS PLATE BOUNDARIES 120 millions years ago WHAT HAPPENED? 225 millions years ago 180 to 120 millions years ago CONTINENTAL DRIFT 65 millions years ago NOW PLAY THE GAME PLATE BOUNDARIES There are a number of different types of plate boundary. Destructive plate boundary http://www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/tectonic_plates_rev4.shtml A destructive plate boundary is sometimes called a convergent plate margin. This occurs when oceanic and continental plates move together. The oceanic plate is forced under the lighter continental plate, causing mountains and possibly volcanoes to form along the destructive plate boundary. Magma rises up through cracks and erupts onto the surface. Friction causes melting of the oceanic plate and may trigger earthquakes. An example of a destructive plate boundary is where the Nazca plate is forced under the South American Plate. Destructive plate boundary Nazca plate is forced under the South American Plate. Collision zones Collision zones form when two continental plates collide. Neither plate is forced under the other, and so both are forced up and form fold mountains. This is how mountain ranges such as the Himalayas and the Alps were formed. Constructive plate boundary A constructive plate boundary, sometimes called a divergent plate margin, occurs when plates move apart. Volcanoes are formed as magma wells up to fill the gap, and eventually new crust is formed. An example of a constructive plate boundary is the Mid-Atlantic Ridge. http://www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/tectonic_plates_rev3.shtml The animation shows how magma pushes up between the two plates, causing a chain of volcanoes along the constructive plate boundary. Conservative plate boundary A conservative plate boundary, sometimes called a transform plate margin, occurs where plates slide past each other in opposite directions, or in the same direction but at different speeds. Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake. This occurs at the San Andreas Fault in California. San Andreas Fault map San Andreas Fault PLATE BOUNDARIES GLOSSARY Write in column B the right words from column C Column A English words Column B Italian words Column C Choice Constructive/divergent plate boundary Si allontanano lighter deriva dei continenti Mid-Atlantic ridge Margine tra zolle To collide Margine distruttivo/convergente tra zolle Destructive/convergent plate boundary Più leggero friction Si muovono insieme Plate boundary dorsale Medio-Atlantica Fold mountains margine costruttivo/divergente tra zolle continental drift attrito Conservative/transform plate boundary Entrare in collisione Move together corrugamenti New crust is formed Margine conservativo/trascorrente tra zolle Move apart Fuoriesce e riempie la frattura Through cracks Si forma nuova crosta Wells up to fill the gap Attraverso le spaccature Plates slide past each other Movimento improvviso Sudden movement Onde d’urto Plates slip past Le zolle scorrono l’una di fianco all’altra friction Le zolle scivolano l’una sotto l’altra shockwaves attrito Answer the questions 1. Give an example of destructive plate boundary ___________________________________________ What happens? ___________________________________________ _________________________________________ __ 2. Give an example of constructive plate boundary. ___________________________________________ What happens? ___________________________________________ _________________________________________ __ 3. Give an example of conservative plate boundary. __________________________________________ What happens? ___________________________________________ _________________________________________ __ Translate the full text on your copybook. TEST 1) A constructive or divergent plate boundary is when: - plates move together. - plates move apart. - plates slide past each other causing friction. 2) A destructive or convergent boundary is when: - plates move together. - plates move apart. - plates slide past each other. 3) At a conservative plate boundary land is: - destroyed. - created. - neither created or destroyed. 4) The Himalayas were formed on what kind of plate boundary? - Constructive - Destructive - Conservative 5) The Mid-Atlantic Ridge or chain of volcanoes formed underneath the Atlantic Ocean is created by what kind of plate boundary? - Constructive - Destructive - Conservative