What happens when two tectonic plates come together?

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What happens when two tectonic plates come
together?

• AKS 17b2

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Deformation

• The process by which a rock changes shape. The
  forces are called stress.

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Three ways it can change

• 1 compression is the stress when an object is
  squeezed
• 2- tension is the stress that occurs when an
  object is stretched
• 3 - shearing is the stress when objects push past
  each other.

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Boundary

• A place where tectonic plates touch. Stress
  occurs here
• Three types of boundaries
• Divergent pulls apart
• Convergent pushes together
• Transform slides beside

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Using your hands demo

• Divergent move hands apart
• Convergent move hands together
• Transform move hands back and forth

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Practice plate boundaries!
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Practice
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Practice
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1 convergent, 2 divergent, 3 transform

• Which happens when two boundaries slide past each
  other.
• What happens when two boundaries come together.
• What happens when two boundaries push apart.

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Divergent boundaries

• Where tectonic plates are pulling apart
• Always oceanic plate and oceanic plate
• Magna rises toward surface and pushes plates
  apart
• Makes new crust
• Causes seafloor spreading
• produces the mid-oceanic ridge

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Watch this!

• http//geology.com/nsta/divergent-boundary-contine
  ntal.gif

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IN YOUR OWN WORDS, DESCRIBE WHAT IS HAPPENING
HERE.
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Transform boundary

• where plates push past each other.
• Can be continental or oceanic plates.
• Ex San Andreas fault in California

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In your own words, what is happening here?
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Watch this!

• http//geology.com/nsta/transform-boundary.gif

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1 divergent, 2 transform

1. Magma comes close to the surface
2. Happens only with oceanic plates
3. Happens when tectonic plates push apart
4. Happen with any kind of tectonic plate
5. Happens when tectonic plates slide past each
   other
6. Results in sea-floor spreading and mid-ocean
   ridges

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Convergent boundary

• Where boundaries push together.
• Can be continental and continental
• Can be oceanic and continental
• Can be oceanic and oceanic

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Continental and continental convergent boundary

• Results in plates being pushed up and creates
  mountains

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Watch this!

• http//geology.com/nsta/convergent-boundary.gif

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Oceanic vs. continental

• Results in the most dense (oceanic) layer being
  subducted. This creates a subduction zone, an
  area where one layer is pushed under the other
  and is remelted and recycled. May result in
  volcanoes

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Watch this!

• http//geology.com/nsta/convergent-boundary-oceani
  c-continental.gif

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Oceanic and oceanic convergent plates

• - results in a subduction zone
• - May result in volcanoes and volcanic islands.

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Watch this!

• http//geology.com/nsta/convergent-boundary-oceani
  c-oceanic.gif

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1 divergent, 2 convergent, 3 transform

1. Results in seafloor spreading
2. Results in mountains
3. Happens when tectonic plates slide past each
   other
4. Happens when tectonic plates push together
5. Happens when tectonic plates pull apart
6. Creates the mid-oceanic ridge

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Identify the boundary
A
B
C