世界地理地球结构与板块的构造英文版.ppt

器 公争 The structure of the earth and Plate Tectonics ②@@西  Structure of the earth The Earth is Mantle made up of 3 Outer core main layers: nner core Core Mantle Crust YOUR PLAN  公 The crust Continental crust Oceanic crust · This is where we live! The Earths crust is made of. Continental Crust Oceanic Crust thick(10-70km thin(-7 km) buoyant (less dense dense(sinks under than oceanic crust continental crust) mostly old young YOUR PLAN  路签 Earth is made of? e How do we know what th Geophysical surveys: seismic, gravity, magnetics electrical, geodesy Acquisition land, air, sea and satellite Geological surveys: fieldwork, boreholes, mines A YOUR PLANET A  路签 What is Plate Tectonics? YOUR PLAN  路签 If you look at a map of the world, you may notice that some of the continents could fit together like pieces of a puzzle YOUR PLAN  Plate Tectonics The Earths crust is divided into 12 major plates which are moved in various directions This plate motion causes them to collide, pull apart, or scrape against each other Each type of interaction causes a characteristic set of earth structures or “ tectonic” features. The word. tectonic. refers to the deformation of the crust as a consequence of plate interaction YOUR PLAN  World plates J用DEF真 YOUR PLAN  What are tectonic plates made of? · Plates are Exosphere made of rigid lithosphere Upper Man The lithosphere is made up of the Outer Core crust and the upper Inner Core part of the mantle YOUR PLAN  公 What lies beneath the tectonic plates? Below the lithosphere (which makes Upper Man up the tectonicMantle plates) is the outer core. asthenosphere. Inner Core YOUR PLAN