Plates Move together : CONVERGENT PLATE BOUNDARIES Learning goals: HOW ARE THE POSITIONS OF THE CONTINENTS CHANGED OVER TIME? • When plates collide.
Download ReportTranscript Plates Move together : CONVERGENT PLATE BOUNDARIES Learning goals: HOW ARE THE POSITIONS OF THE CONTINENTS CHANGED OVER TIME? • When plates collide.
Plates Move together : CONVERGENT PLATE BOUNDARIES Learning goals: HOW ARE THE POSITIONS OF THE CONTINENTS CHANGED OVER TIME? • When plates collide or meet • Ocean plates that meet another ocean plate or a continental plate will be pulled under either the other ocean plate of continental plate in a process called subduction. • The worlds largest earthquakes happen when the subducting plate gets stuck then suddenly breaks apart. • The most explosive and dangerous volcanoes are found near convergent subducting boundaries. • The worlds deepest landforms, trenches are found at subducting convergent boundaries • When two continental plates collide folding up to form mountain ranges Main Idea • Plates move together Supporting details • CONVERGENT BOUNDARY • Also called: – collision boundary, – destruction boundary, • Plates are pushed together • Crust is usually destroyed Overriding plate Subducting plate Mail Idea • Processes that destroys crust Supporting details • SUBDUCTION occurs underwater • Plates are pushed together Subduction occurs in the ocean – The place that subduction takes place is often called a Subduction Zone – Subduction destroys lithosphere • UPLIFTING – occurs on land – When 2 continental plates meet – NO lithosphere is destroyed Main idea Supporting details • 3 types of convergent boundaries Subduction zone Convergent boundary – 1. Ocean to Ocean • DESTRUCTIVE BOUNDARY– land is destroyed • ocean plate moves over another ocean plate in a process called subduction – • This occurs at a location called a subduction zone • Landforms created at an ocean to ocean convergent boundary • Landforms created: – Deep ocean Trenches – Volcanic Arc islands – Volcanoes • Geologic Activity at an Ocean to Ocean convergent boundary • Earthquakes • Volcanic eruptions Volcanic Arc Island Ocean lithosphere Subduction zone Draw and label this diagram in your notes Ocean lithosphere main idea Convergent boundary– ocean to continent Supporting details • DESTRUCTIVE BOUNDARY • Ocean plate moves under continental plate in process called subduction • Geologic Activity – Earthquakes – Explosive Volcanic eruptions Convergent boundary– ocean to continent • Landforms, features and structures • Landforms created – Deep ocean trenches occur where plates meet – Volcanic mountain ranges are formed Ocean lithosphere Draw and label this diagram in your notes Continental lithosphere Subduction zone Main idea Supporting details Convergent boundaries – 3. continent to continent • NO CRUST IS DESTROYED • Plates move into each other – process =up lifting • Landform created: – Mountain ranges – Volcanoes extremely rare • Geologic activity: – Earthquakes Many mountain ranges have formed this way -Appalachians -Himalayans -Rocky mountains -Alps http://blank005.tripod.com/geology/deformation.html Review: HOW ARE THE POSITIONS OF THE CONTINENTS CHANGED OVER TIME? • When plates collide or meet • Ocean plates that meet another ocean plate or a continental plate will be pulled under either the other ocean plate of continental plate in a process called subduction. • The worlds largest earthquakes happen when the subducting plate gets stuck then suddenly breaks apart. • The most explosive and dangerous volcanoes are found near convergent subducting boundaries. • The worlds deepest landforms, trenches are found at subducting convergent boundaries • When two continental plates collide folding up to form mountain ranges Bubble Maps are used to describe things. Name of geologic ACTIVITY that happens 1 bubble for each activity Name of force name of Convergent boundary Name of geologic landform created 1 bubble for each landform 1. Create 3 bubble maps and describe the 3 types of CONVERGENT PLATE BOUNDARIES 2. Copy the example that has been provided for you 3. Then do one for Trenches Volcanoes Volcanic Arch Islands Earthquakes Ocean to Ocean convergence compression Describing an ocean to ocean convergent boundary Earthquakes Explosive Volcanic eruptions Compression Ocean to continent convergence Volcanic mountain ranges Describing an Ocean to Continent convergence Trenches