DO NOW: Day #1 HW due Friday!
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- Betty Briggs
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1 5. What landform is created when two continental plates come together? DO NOW: Day #1 HW due Friday! 1. What is the difference between an oceanic plate and a continental plate? 2. What happens at a convergent plate boundary? 3. What is subduction? Why does it happen? 4. What landforms does subduction create?
2 Divergent Plate Boundaries
3 Types of Plate Boundaries Convergent plates move toward one another Transform plate moves sideways from each other Divergent plates move away from each other
4 Divergent Boundary (hand motion) When two plates move or spread apart from each other Connection/C.F.U.: What causes them to move apart from each other? 1.cfm?chapter_no=visualization
5 Instructional Video UG_N8 (3:30 and 5:57) Listen carefully and take notes. See how much of the important information you can pick out
6 Two Oceanic Plates Diverging: - Cause the Sea-Floor to Spread - As plates spread, magma comes up and cools as it hits the ocean water and hardens forming new rock. - As new rock piles on top of each other, mountains form under the ocean called a mid-ocean ridge!
7 What does this actually look like? Video 1: And Video 2:
8 Newest/Youngest Rock As the plates spread and magma hardens to form rocks we get the newest crust on Earth. Baby infant rocks!
9 Two Continental Plates Diverging: -Creates a dip in the crust (valley) -These plates are thicker (not denser) very harder to crack. As they spread they sink creating a RIFT VALLEY and this valley can fill with water making a sea! --the Great Rift Valley, East Africa --the Red Sea
10 Stress The stress that occurs during a divergent boundary is called tension. Tension happens when the plates are being pulled apart from one another.
11 Draw and Label A Divergent Boundary Oceanic Continental
12 Ireland: Hikers walk in the shadow of cliffs. The divergent Mid-Atlantic Ridge rises above sea level, with the North American plate to the west and the Eurasian plate to the east.
13 Divergent Plates What happens What forms Oceanic Sea-floor spreading happens and magma comes up and cools forms new rock Mid-ocean ridges (Example: the Mid-Atlantic ridge) and new crust Continental Plates spread and then sink to form a basin (bowl shape) Rift valleys, (and Seas if filled with water) (Example: the Red Sea)
14 Review- Let s see what you know! What direction do the plates move in a divergent boundary? What is causing the plates to move? What 2 landforms are created during divergent boundaries? How does new rock form?
15 DO NOW: Day #2 HW due Friday! 1. What is a divergent boundary? 2. When 2 oceanic plate diverge, what does it cause? What forms from 2 oceanic plates diverging? 3. When 2 continental plates diverge, what does it cause? What forms from 2 continental plates diverging? 4. How do we get new rocks to form? (Hint: think about magma)
16 Review- Let s see what you know! What direction do the plates move in a divergent boundary? What is causing the plates to move? What 5 landforms are created during divergent boundaries? How does new rock form?
17 Divergent Plates What happens What forms Oceanic Sea-floor spreading happens and magma comes up and cools forms new rock 1. Mid-ocean ridges Example: the Mid- Atlantic ridge 2. Sea-floor spreading 3. New rock Continental Plates spread and then sink to form a basin (bowl shape) 4. Seas Example: the Red Sea 5. Rift Valley
18 Divergent Foldable- 3 tabs Tab 1: Name of boundary, Definition of a divergent boundary, drawing with arrows, type of stress this boundary undergoes. Tab 2: Oceanic- Oceanic Description of what is happening. Are these plates on land or under water? What 3 landforms are made from these 2 plates How are these landforms made? Tab 3: Continental- Continental Description of what is happening. Are these plates on land or under water? What 2 landforms are made from these 2 plates How are these landforms made?
19 Exit Ticket
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