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SCIENCE 8 Plate Tectonics NAME: ___________________________ BLOCK: ____ DATE: _________________ Lesson 2/3: Movement of Tectonic Plates Goals: -to describe why tectonic plates move (mantle convection) -to explain how mantle convection occurs -to describe what plate boundaries are and what happens when tectonic plates move Key words: mantle, convection, plate boundaries, density, oceanic crust, continental crust, divergent plate boundary, convergent plate boundary, transform plate boundary WHY DO PLATES MOVE? • Tectonic plates move due to mantle convection • But what is convection? Where is the water warmer and cooler?____________________________________________________ Why does the cooler water sink and warm water rise?__________________________________________ What happens to the wood blocks?________________________________________________ Define convection in your own words: Mantle convection: Fill in blanks in the following using the above and the video to help • As the mantle changes temperature, it changes______________________. Hot mantle is _____________________________and rises, while cooler mantle is ____________________________________and sinks. • This exchange creates a “__________________________________________” of mantle • As the mantle material moves, it drags the __________________________________with it. • convection is caused by heat of __________________and__________________________ in mantle What happens when plates move? • Tectonic plates (made of the___________________________________) move slowly and float on the ____________________________________(which flows like toothpaste) • Plates interact with each other at their edges, known as ____________________________________ Types of Boundaries • There are three types of plate boundaries: convergent, divergent and transform o Convergent plate boundary: formed when two plates ______________________________________ o Divergent plate boundary: formed when two plates ________________________________________ o Transform plate boundary: formed when two plates ________________________________________ ------------------------------------------------------------------------------------------------------------------------------------------------Assignment1. Read pages 290 to 292 (in BC Science Connections) and complete the following: Describe the thickness and density of the two types of crust: Oceanic Continental 2. Complete the handout on the types of boundaries 2