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Date _____________ __-N Plate Tectonics – Guided Notes Plate Tectonics: 1. According to the theory of ______________ ___________________, Earth’s crust and part of the upper mantle, known as the _______________________, are broken into sections. 2. These sections, called__________________ , move on a plasticlike layer of the mantle, known as the __________________________. Plate Boundaries: 1. Plates can ____________ , or ______________ or __________ ___________ or slide alongside one another. 3 Types of Plate Boundaries: A. Plates Moving Apart – 1. ______________ _________________ : The boundary between two plates that are moving apart. 2. _________________ __________________ : a. New sea floor being made, b. Underwater Volcanic mtns Other features found at the Mid-Ocean Ridge: • • • 3. Another type of Divergent boundary is the: ___________________________________________. - Features found at a Rift Valley • ___________________ ___________________ • ______________ _____________ created by a ________________ force B. Plates Moving Together 1. ___________________ ____________________ : occurs where two plates move together. (collide causing a collision area – like a head on crash of two cars) 2. Where Two Continental Plates Collide They form: _________________________ (material being scraped up and pushed together) _________________________ 3. When an ______________ plate converges with a less dense ___________________ plate, the denser oceanic plate sinks under the continental plate. 4. __________________ _______________ : The area where an oceanic plate subducts, or goes down, into the mantle. Features found at a subduction zone….. • __________________ • __________________ • __________________ • ______________________________________ 5. _________________ _______________ type of convergent boundary created where one plate bends and sinks beneath the other. • Old Sea Floor being destroyed 6. The newly formed magma is forced upward along these plate boundaries, forming ___________________. Where Plates Collide 1. A subduction zone also can form where two __________________ plates converge. • In this case, the colder, older, ________________ oceanic plate bends and sinks down into the mantle. C. Where Plates Slide Past Each Other 1. _________________ ___________________ : Occur where two plates slide past one another. • They move in opposite directions or in the same direction at different rates. Features: _____________________ The ________ ______________ ______________ is part of a transform plate boundary. It has been the site of many earthquakes. Causes of Plate Tectonics ___________________ ______________________: The cycle of heating, rising, cooling, and sinking. • This process occurs in the ________________, it is thought to be the force behind plate tectonics.