PLATE MOVEMENT
Ms. Sikes
Bell Ringer
• In the bucket is a quiz for you to take. You
need to put the quiz on a new sheet in your
bell ringer folder. When you are done turn it in
to your period’s basket.
• Grab the notes from my desk and put them
into your science notebook.
Plate movement
• Continental Drift is the hypothesis that states that the
continents once formed a single landmass, broke up
and drifted to their present locations.
• The single landmass that was once proposed to hold all
of the continents together was called Pangea.
• Continental drift also explained why fossils of the same
plant and animal species are found on continents that
are on different sides of the Atlantic Ocean.
SEA FLOOR MOVEMENT
• Mid- Ocean Ridges are underwater mountain
chains that run though Earth’s ocean basins.
This is where sea-floor spreading occurs.
• Sea- Floor Spreading is the process by which
new oceanic lithosphere forms as magma rises
toward the surface and solidifies.
• Below draw a picture of a divergent boundary
and sea-floor spreading occurring.
SEA-FLOOR SPREADING
EVIDENCE FOR SEA-FLOOR
SPREADING: MAGNETIC REVERSALS
• North and South Poles reverse their places.
• Evidence of this taking place is from tiny grains of
magnetic minerals like iron that work as compasses.
They align with the magnetic field of the Earth and
provide record of magnetic reversals and sea-floor
spreading.
TECTONIC PLATE BOUNDARIES:
CONVERGENT
• Continental-Continental Collisions: is when
two tectonic plates with continental crust,
collide, they buckle and thicken, which pushes
the continental crust upward.
– These collusions cause mountains to form.
TECTONIC PLATE BOUNDARIES:
CONVERGENT
• Continental-Oceanic Collisions: When a plate with
oceanic crust collides with a plate with
continental crust. The denser oceanic crust sinks
into the asthenosphere.
– This creates a subduction zone where old ocean crust
gets pushed into the asthenosphere, where it is
remelted and recycled.
TECTONIC PLATE BOUNDARIES:
CONVERGENT
• Oceanic-Oceanic Collisions: When two
tectonic plates with oceanic lithosphere
collide, one of the plates with oceanic
lithosphere is subducted , or sinks, under the
other.
– Creates a subduction zone
TECTONIC PLATE BOUNDARIES:
DIVERGENT
• Creates volcanoes and mid-ocean ridges
TECTONIC PLATE BOUNDARIES:
TRANSFORMING
• Creates fault lines and earthquakes
Assignment
Convergent (continental to continental)
1.
2.
3.
4.
5.
Title
Describe what happens (what kind of plate runs into
what kind of plate)
Draw a picture
What is formed at this boundary?
Explain WHY that is formed at this boundary
Convergent (continental to oceanic)
1.
Title
2.
Describe what happens (what kind of plate runs into
what kind of plate)
3.
Draw a picture
4.
What is formed at this boundary?
5.
Explain WHY that is formed at this boundary
Convergent (oceanic to oceanic)
1.
Title
2.
Describe what happens (what kind of plate runs into
what kind of plate)
3.
Draw a picture
4.
What is formed at this boundary?
5.
Explain WHY that is formed at this boundary
Divergent
1.
Title
2.
Describe what happens (what do the
plates do?)
3.
Draw a picture
4.
What is formed at this boundary?
5.
Explain WHY that is formed at this
boundary
Transform
1.
Title
2.
Describe what happens (what do the
plates do?)
3.
Draw a picture
4.
What is formed/what happens or is
produced at this boundary?
5.
Explain WHY that is produced at this
boundary.