Plate Tectonics

Map of the World Looking at the map of the world above, do you think the continents could have ever been connected? Alfred Wegener •Wegener’s theory of continental drift explained why some land masses fit like puzzle pieces•a German scientist, first had the idea that continents can drift around the globe•idea was that all of the Earth's continents were once joined together in a super continent called Pangaea Two Types of Crust Continental Crust land masses less dense granite Oceanic Crust oceans and water more dense basalt The Earth’s crust is broken into pieces called tectonic plates. Describe in your own words how convection works. What layer of Earth are convection currents found? crust lithosphere asthenosphere core •Geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced or sinks due to gravity into the mantle. Match. convergent collide or converge divergent pull apart of diverge transform slide past Convergent boundary is when two plates do what? come together pull apart slide past each other What forms when two continental plates come together? Which is more dense? oceanic plate continental plate What forms when an oceanic plate and a continental plate come together? Divergent boundary is when two plates do what? come together pull apart slide past each other What happens to magma when it reaches the Earth's surface? Transform boundary is when two plates do what? come together pull apart side past each other What provides evidence that our plates are moving? ocean basin depressed portion of the ocean plate boundaries where two plates meet mountain building formed at convergent boundaries