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COT PLATE TECTONIC.pptx
- 2. REVIEW
- 3. ___ O ___ ___ ___ A ___ N RA___G__
- 5. E___ ___T ___ ___U A ___ E
- 6. EARTHQUAKE
- 7. V___ ___ ___A ___ O
- 8. VOLCANO
- 10. PLATE TECTONICS
- 11. Have you ever wondered how volcanoes and mountains were formed?
- 14. CRUST - the outermost layer of the Earth The crust that makes up the continents is called CONTINENTAL CRUST. The crust that underlies the ocean floor is called OCEANIC CRUST. CONTINENTAL CRUST - 40 - 70 km thick made up of less dense granitic rocks OCEANIC CRUST - average thickness of 5km made up of denser basaltic rocks
- 15. CRUST The crust is largely composed of alumina (Al2O3) and silica (SiO2) The alumina content of land (continental crust) is 15.2% and about 16.5% on ocean floor. The silica content of land is 60.2%; oceanfloor, 48.6%
- 16. LITHOSPHERE A part of the land that is moving is the Earth's surface called lithosphere. made up of Earth's crust and a part of the upper mantle The lithosphere moves a big chunks of land called tectonic plates. Some of these plate are huge and cover entire continent.
- 17. Plate tectonics is a scientific theory describing the large- scale motion of the plates making up Earth's lithosphere since tectonic processes began on Earth between 3.3 and 3.5 billion years ago. Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit together like a puzzle, but they're not stuck in one place. They are floating on Earth's mantle, a really thick layer of hot flowing rock. PLATE TECTONICS
- 18. PLATE TECTONICS Theories Contraction Theory proposed in early years of the 20th century. This theory suggested that the Earth cooled after its formation, its surface contracted and wrinkled. The wrinkles are now considered as the mountain ranges. proposed by Alfred Wegener in 1912.The theory asserted that there once existed a very large landmass, a super continent called Pangaea. Theory of Continental Drift
- 19. Theories Seafloor Spreading Theory American geologist Harry Hess, 1960. Says that the seafloor/ocean floors, not continents move and only carry continents Tectonic Plate Theory incorporates the continental drift theory and sea floor spreading theory. For plate tectonics the lithosphere is composed of massive slabs of solid rocks called plates.
- 21. 7 PRIMARY PLATES 1. Eurasian Plate, 2. Australian Plate, 3. Pacific Plate, 4. North American Plate 5. South American Plate 6. African Plate, 7. Antartic Plate
- 22. 8 SECONDARY PLATES 1. Juan De Fuca Plate 2. Nazca Plate 3. Cocos Plate, 4.Caribbean Plate 5. Philippine Plate 6. Arabian Plate 7. Indian Plate 8. Scotia Plate
- 23. MECHANISMS OF PLATE MOVEMENTS Slab pull - force due to weight of cold, dense sinking tectonic plate Ridge push - the force due to buoyancy of the hot mantle rising to the surface Mantle convection - heat in the core rises toward the mantle. 3 Main forces
- 24. PLATE BOUNDARIES interaction along plate boundaries from different bodies of water and land forms
- 25. Divergent Plate Boundary two plates that move away from each other create a gap or a rift between them. Divergent boundaries between oceanic plates produce mid-ocean ridges. In places where molten lava or magma can move up and fill the gap, volcanic islands are eventually formed. Molten lava that rises eventually cools and forms part of the ocean, that also called seafloor spreading or ocean floor spreading.
- 26. Convergent Plate Boundary occur when two plates slide toward each other and formed either a subduction zone or orogenic belt. When twooceanic plates collide, a subduction zone is formed.
- 27. When oceanic plate collides with continental plate, the oceanic plate subducts beneath the continental plate, possibly forming a trench. Volcanic mountains also develop on land.
- 28. When two continental plates collide, no subduction happens. The continental crust buckles and rocks pile up, creating towering mountain ranges.
- 29. Tansform Plate Boundary the plates slide against each other in opposite directions. Nomountains or volcanoes are produced, instead earthquakes result from the movement of plates, and release massive amounts of energy.
- 30. Group Activity Draw/create a model of the different types of Plate Boundaries and present it to the class.
- 31. For Group 1 will create Transform Boundaries For Group 2 will create Divergent Boundaries For Group 3 will create Convergent showing subduction and collision form.
- 32. RUBRICS FOR THE ACTIVITY 5 4 3 2 1 Concept Cooperation Presentation
- 35. How important are the movement of plates leads to the formation of folds and faults Sharing is caring
- 36. To sum up!
- 37. Lithosphere Moving plates plate tectonics boundaries convergent divergent transform volcano formation earthquakes mountain formations To sum up! To sum up!
- 38. Short Quiz
- 39. Directions. From the word pool given below, identify the term being described in the following statements. __________1. This phenomenon is created during transformation of plate’s movement and it is a kinematic phenomenon caused by the relative density of oceanic lithosphere and relative weakness of asthenosphere. __________2. This plate’s movement creates mountain and volcanic arc. Marianas Trench is also created by this movement. __________3. The movement of this plate is towards the opposite direction or moving away from each other. __________4. It is a process of rising up hot, dense liquid materials and creates new seafloor. __________5. This is a theory that supports that supports continental drift theory and seafloor spreading. Seafloor Spreading Plate Tectonic Transform fault Divergent Convergent
- 40. Assignment
- 41. Directions. Conduct a short interview with one or two of your family members. Ask them about how they think the mountain, valley, ridges and volcanoes were formed. List all of their responses. Afterwards, inform them on how those formations formed based on what you have learned from this lesson.