Post on 19-Dec-2015
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
• Plates move together
• CONVERGENT BOUNDARY• Also called:– collision boundary, – destruction boundary,
• Plates are pushed together • Crust is usually destroyed
Main Idea Supporting details
Overriding plate
Subductingplate
• Processes that destroys crust
• 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
Mail Idea Supporting details
• 3 types of convergent boundaries • 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
Convergent boundary – 1. Ocean to Ocean
Main idea Supporting details
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
Oceanlithosphere
Oceanlithosphere
Volcanic Arc Island
Subductionzone
Draw and label this diagram in your notes
Convergent boundary–
ocean to continent
• DESTRUCTIVE BOUNDARY
• Ocean plate moves under continental plate in process called subduction
• Geologic Activity– Earthquakes– Explosive Volcanic
eruptions
main idea Supporting details
Convergent boundary–
ocean to continent• Landforms,
features and structures
• Landforms created– Deep ocean trenches
occur where plates meet
– Volcan ic mountain ranges are formed
Ocean lithosphere
Continental lithosphere
Subduction zoneDraw and label this diagram in your notes
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
Main idea Supporting details
http://blank005.tripod.com/geology/deformation.html
Many mountain ranges have formed this way-Appalachians-Himalayans-Rocky mountains-Alps
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.
1. Create 3 bubble maps and describe the 3 types of CONVERGENT PLATE BOUNDARIES2. Copy the example that has been provided for you3. Then do one for
name of Convergent boundary
Name of force
Name of geologic landform created 1 bubble for
each landform
Name of geologic
ACTIVITY that happens 1 bubble for
each activity
Ocean to Ocean
convergence
Trenches
Volcanic Arch Islands
Volcanoes
Earthquakes
compression
Describing an ocean to ocean convergent boundary