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The Different Types of Boundaries & The Continental Drift What is it? What does it do? Slide 2 What happens under the crust of the Earth? Under incredible pressure and intense heat Extreme heat energy causes movement of material within the Earth Slide 3 What are plates? Large continent-sized blocks Driven by this heat to move slowly about the Earths surface They are not connected to one another, but move freely about. Like your left over Cheerios Slide 4 Plates Continued These plates bump, push, and scrape past the plates around them. The edges, or boundaries, of plates are called faults. Most volcanoes and earthquakes occur on these faults. Slide 5 Different Types of Boundaries Convergent Boundary Divergent Boundary Sliding, Strike-Slip, or Transform Boundaries Slide 6 When plates push together, a convergent boundary is formed. Convergent Boundary Slide 7 Above the Earths crust: Causes mountain ranges, such as the Appalachian Mountains of Virginia, to rise up from the Earths surface Miles below the Earths crust in the ocean: Force plates downward instead of upward and deep trenches are formed Convergent Boundary Slide 8 Slide 9 Slide 10 Convergent Boundaries can form trenches or mountains Slide 11 The Different Plates Under Water Slide 12 Slide 13 Divergent Boundary When plates move apart, a divergent boundary is formed. They occur on the ocean floors of the Earth. Slide 14 Magma rises up between the two separating plates making volcanoes and mountain ranges The mountain ranges are called: Mid-ocean Ridges Most of Earths new crust (meaning NEW land) comes from the magma that erupts from these divergent boundaries and the volcanoes they create. Divergent Boundary Slide 15 Volcanoes Form Because of Divergent Boundaries Slide 16 Mountain Ranges Are Created Because of Divergent Boundaries Slide 17 Slide 18 Divergent Boundaries: Push Away Slide 19 Sliding, Strike-Slip, or Transform Boundaries When plates slide past each other horizontally, sliding, strike-slip, or transform boundaries are formed. Slide 20 The boundaries slide and then everything shifts Slide 21 These types of boundaries grind against each other causing earthquakes. Ex. On the west coast of the United States Causes earthquakes in the state of California. Sliding, Strike-Slip, or Transform Boundaries Slide 22 Transform Boundaries Slide 23 Continental Drift This process of plate movement that moves the Earths continents is called continental drift. These movements, past and present, are responsible for the amazing geological features of our Earths ever-changing surface. Slide 24