plate tectonics theory.pdf; boundaries.1
- 1. The Theory of Plate Tectonics: Boundaries, Stresses, and Faults
- 2. What are Plates? A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust. Lithosphere are broken into sections called plates.
- 3. The continental crust is thicker but less dense than the oceanic crust.
- 5. What makes the plates move? The movement of the lithosphere is called tectonics
- 6. What makes the plates move? Convection Currents in the mantle move the plates as the core heats the slowly-flowing asthenosphere.
- 7. What is Plate Tectonics Theory? The theory which states that Earth’s lithosphere is composed of plates that move around and interact with one another.
- 8. What is Plate Tectonics Theory? It explains the processes that cause the formation of different geologic features and phenomena.
- 10. Plates move slowly in different directions
- 11. Plate Boundaries The edges of Earth’s plates meet at plate boundaries or plate margins
- 12. Plate Boundaries There are 3 types of plate boundaries A different type of plate movement occurs along each type of plate boundary convergent transform divergent
- 13. I. Divergent Boundaries A plate boundary where two plates move away from each other. It causes fracture in the lithosphere, resulting in the upwelling of hot molten materials
- 14. What happens next at Divergent Boundaries? May form RIFT VALLEYS on continents SEA-FLOOR SPREADING in the ocean
- 15. Rift Valley is a lowland region that forms where Earth's tectonic plates move apart, or rift.
- 17. Mid-Ocean Ridge It is a seafloor mountain system formed by plate tectonics. It typically has a depth of about 2,600 meters and rises about 2,000 meters above the deepest portion of an ocean basin.
- 18. Mid-Ocean Ridge This feature is where seafloor spreading takes place along a divergent plate boundary.
- 19. Seafloor Spreading It is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
- 21. II. Converging Boundaries A plate boundary where two plates move towards each other. There are 3 types of converging boundaries
- 22. Types of Converging Boundaries Oceanic-continental convergence Oceanic-oceanic convergence Continental-continental convergence
- 24. Types of Converging Boundaries 1). Oceanic-continental convergence - the denser oceanic crust moves beneath the continental crust
- 25. Types of Converging Boundaries At the continental crust, volcanoes are formed parallel to the subduction zone.
- 26. Types of Converging Boundaries Trench is a deep, narrow depression on the ocean seafloor caused by the collision and/or subduction of plates.
- 27. Types of Converging Boundaries 2. Oceanic-oceanic convergence - collision between two oceanic plate
- 28. Types of Converging Boundaries Mariana Trench – the result of subduction between Pacific Plate with the Philippine Plate
- 29. Types of Converging Boundaries 3. Continental-continental convergence - the folding of parts of the continental lithosphere happens causing the formation of mountains.
- 30. III. Transform Boundaries A plate boundary where two plates move past each other in opposite direction.
- 31. San Andreas Fault, California, USA
- 34. Pacific Ring of Fire also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. More than 450 volcanoes are located along the Ring of Fire.