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You will learn to recognize features caused by plate tectonics. Section 4.3 Theory of Plate Tectonics Objectives: You will learn to compare and contrast divergent, convergent, and transform plate boundaries. You will learn to describe how heat inside Earth causes plate tectonics. You will learn to recognize features caused by plate tectonics.

Plate Movements!!! plate tectonics - 1968 – ____________ theory was developed - ____________ – states the Earth’s _____ and upper ______ are broken into sections - sections are called _____ and they move around the ______ plate tectonics crust mantle plates mantle

Composition of Earth's Plates!!! - __________ - plates are composed of the crust and a part of the upper mantle - ____________ - plastic-like layer below the lithosphere lithosphere asthenosphere

1. Divergent Plate Boundary ______________________ Plate Boundaries!!! 1. Divergent Plate Boundary ______________________ 2. Convergent Plate Boundary 3. Transform Fault Boundary

1. Divergent Plate Boundary - _________________ – the boundary between ____ plates that are moving ______ from one another _______________ divergent boundary two apart Examples: Mid-Atlantic Ridge Great Rift Valley

2. Convergent Plate Boundary ______________________ – the boundary between ____ plates that are moving ________ each other 3 kinds of convergent plate boundaries: convergent plate boundary two towards ocean – continental ________________________________________________________________________ ocean – ocean continental - continental

Ocean - Continental - ____________ - the area where an ______ plate ________ into the upper ______ in this kind of collision - ________ occur above subduction zones subduction zone oceanic descends mantle volcanoes

3. Transform Fault Boundary - ________________________ – the boundary between ____ plates that _____ past one another and are moving in ________ directions or in the same direction at different ______ - _____________ are a result of transform fault boundaries - the Pacific Plate is sliding past the North America Plate, forming the famous _________________ two slide opposite rates earthquakes Example: San Andreas fault

Causes of Plate Tectonics!!! convection 1. ___________ ________ – the cycle of heating, rising, cooling, sinking 2. differences in ________ are the main cause of this cycle to occur currents density

Effects of Plate Tectonics!!! 1. mountains ___________________________ 2. rift ocean basins 3. volcanoes 4. earthquakes

Let’s Review!!! What does the theory of plate tectonics state? What makes up the lithosphere? What is located below the lithosphere? Name the three kinds of plate boundaries. Which type of plate boundary causes earthquakes to occur? Which type or plate boundary causes volcanoes to form?