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Bellringer • Iceland is a large island in the Atlantic ocean. Iceland is part of the mid-ocean ridge and contains many volcanoes. What type of boundary created Iceland? Agenda • 1. Anticipatory Set • 2. Input – Notes on divergent boudaries • 3. Modeling – how to answer complex questions • 4. Guided Practice – team work • 5. Independent Practice • 6. Early finishers – models • 7. Closing Objective • After today, you will be able to predict the effects of divergent boundaries based on crust type. You will also be able to answer questions on all types of boundaries. Big Goal Connection • 80% Mastery 4.4 Boundary Predictions Continental and Continental • When two continental plates diverge they form a rift valley. Oceanic and Oceanic When two oceanic plates diverge they form a midocean ridge. Transform Boundary • When two plates of any type lie along a transform boundary, they rub against each other causing shearing, fault lines, and earthquakes. Let’s Practice… • 1. What is the effect of two continental plates diverging? • 2. What is the effect of two oceanic plates diverging? • 3. What are the effects of a transform boundary? Modeling Which of these describes a convergent boundary? a) Two continental plates colliding, forming a midocean ridge b)Two continental plates rubbing against each other, causing earthquakes c) Two continental plates moving away from each other, forming a rift valley d)An oceanic plate subducting under a continental plate, forming a volcanic arc GP1 Which of these describes a transform boundary? a) An oceanic plate subducting under another oceanic plate, forming a trench b)Two oceanic plates moving away from each other, forming a midocean ridge c) Two continental plates colliding, forming a mountain range d)Two continental plates rubbing against each other, causing earthquakes GP2 Which of these describes a convergent boundary? a) Two continental plates moving away from each other, forming a rift valley b) Two oceanic plates rubbing against each other, forming a midocean ridge c) Two continental plates colliding, forming a mountain range d) Two oceanic plates moving away from each other, forming a volcanic arc Modeling • Lake Tanganyika, located in Eastern Africa, is located in a rift valley. It is the largest rift lake in Africa and the second largest lake by surface area on the continent. What type of plate interaction could have created Lake Tanganyika? a) b) c) d) Subduction Convergent plates Divergent plates Transverse plates GP3 • The Red Sea is a narrow sea between the African and Arabian plates. The Red Sea was created when these continental plates moved away from each other creating a large rift valley. What type of plate boundary could have created the Red Sea? a) b) c) d) Convergent boundary Divergent boundary Transform boundary Earthquakes Modeling • The Alpine fault forms the boundary between the Australian and Pacific plates, along which the two plates slide horizontally past each other. Scientists classify the Alpine fault as a transform fault. What is one of the most common effects of a transform fault? a) b) c) d) Volcanic eruptions Tornadoes Earthquakes Seafloor spreading GP4 The Cascades lie on the boundary between the North American and Juan de Fuca Plate. The Juan de Fuca Plate subuducted under the North American Plate. What is one of the most common effects of subduction of an oceanic plate under a continental plate? a) A volcanic mountain range b)A rift valley c) A midocean ridge d)Volcanic islands Modeling Two plates composed of rock of different densities meet along a convergent boundary. Which statement describes what will happen where the two plates meet? a) The plates will collide, and the compression will heat the plates, causing some of the plates to melt and form a rift valley. b) The plates will converge, causing one plate to subduct underneath the other plate and forming a deep trench along the boundary. c) The plates will rub against each other, causing shearing and creating fault lines in the interior of the plates. d) The plates will collide with neither plate subducting, causing the crust to pile up and form a mountain range. GP5 Two plates composed of rock of similar density lie along a transform boundary. Which statement describes what will happen where the two plates meet? a) The plates will rub against each other, causing shearing and creating fault lines in the interior of the plates. b) The plates will collide with neither plate subducting, causing the crust to pile up and form a mountain range. c) The plates will collide, and the compression will heat the plates, causing some of the plates to melt and form volcanic mountains. d) The plates will rub against each other, causing one plate to subduct underneath the other plate and forming a deep trench along the boundary. Modeling Which of these describes the outcome of the collision between oceanic and oceanic crust? a) The two portions of crust will slide past one another, side by side. b) The two portions of the crust will collide and pile up. c) The two portions of crust will stop moving. d) The denser oceanic crust will subduct beneath the other oceanic crust. GP6 Which of these describes the outcome of the collision between oceanic and continental crust? (DOK 2) a) The two portions of crust will stop moving. b) The continental crust will subduct beneath the oceanic crust. c) The two portions of crust will slide past one another, side by side. d) The oceanic crust will subduct beneath the continental crust. 4.4 Independent Practice