Transcript convergent plate boundaries

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