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http://www.geophysics.rice.edu/plateboundary/ Where are the Earth’s tectonic plates and their boundaries? What happens at plate boundaries? How do Earth scientists classify plate boundaries?. Part 1.

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slide1

http://www.geophysics.rice.edu/plateboundary/

Where are the Earth’s tectonic plates and their boundaries?

What happens at plate boundaries?

How do Earth scientists classify plate boundaries?

part 1
Part 1.
  • Identify the patterns of your area of expertise – volcanology, seismology, geography, geochronology - AT PLATE BOUNDARIES
  • Describe what you observe – do not interpret what you see, just describe the patterns
  • Wide or narrow, straight or curved, symmetric or not symmetric, deep or shallow, ridge or valley, active or inactive
  • Identify 3-5 boundary types; color each on your transparency; define in words
part 2
Part 2.
  • Bring together areas of expertise – volcanology, seismology, geography, geochronology
  • Correlate your data sets; what collective patterns emerge?
  • Identify 3-5 boundary types; color each on a master transparency; define in words
part 3
Part 3.
  • Describe the different types of boundaries
  • What patterns were related in the different data sets?
plate tectonics
Plate Tectonics
  • The upper mechanical layer of Earth (lithosphere) is divided into rigid plates that move away, toward, and along each other
  • Most (!) geologic action occurs at plate boundaries in DISTINCT patterns
slide7

Compositional

Physical / Mechanical

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1. Divergent Boundaries

  • Volcanic activity in fissures, some volcanos
  • Shallow earthquakes, on plate boundary
  • Young crust, symmetrical around boundary
  • Ridge
  • Rocks?

Mid-

Atlantic

Ridge

North American

Plate

Eurasian

Plate

slide15

Nazca Plate

South American Plate

Antarctic Plate

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2. Convergent Boundaries

(a) Ocean-continent convergence

  • Volcanos tight, parallel boundary, landward
  • Shallow to deep earthquakes
  • Age varies on one side of the boundary; not symmetrical
  • Trench, mountain chain
  • Rocks?

Andes

Mountains

Peru-Chile Trench

South

American

Plate

Nazca Plate

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2. Convergent Boundaries

(b) Ocean-ocean convergence

  • Volcanos tightly spaced, parallel boundary, arc
  • Shallow to deep earthquakes
  • Age varies on one side of the boundary; not symmetrical
  • Trench, volcanic island chain
  • Rocks?

Mariana Islands

Marianas Trench

Philippine

Plate

Pacific Plate

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Eurasian Plate

Indian Plate

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Tibetan Plateau

Mt. Everest

Himalayan Mtns.

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2. Convergent Boundaries

(c) Continent-continent convergence

  • Volcanos rare, dispersed
  • Shallow (to medium) dispersed earthquakes
  • No age data
  • High mountain chain
  • Rocks?

Himalayan

Mountains

Tibetan

Plateau

Indian-Australian Plate

Eurasian

Plate

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3. Transform-Fault Boundaries

  • Volcanos dispersed, most on one side
  • Earthquakes complex, shallow (to medium) on both sides
  • Age data not symmetrical, one side of boundary
  • Complex topography, wide mountains and basins
  • Rocks?

Pacific Plate

North American Plate

plate tectonics1
Plate Tectonics
  • The upper mechanical layer of Earth (lithosphere) is divided into rigid plates that move away, toward, and along each other
  • Most (!) geologic action occurs at plate boundaries in DISTINCT patterns
slide36

It’s all about convection and heat (loss)!

Vigorous convection drives plate tectonics

and for the rest of the week
And for the rest of the week …
  • What features do you expect to see on other planets if plate tectonics processes are active?
  • What does this tell you about the interior of the planet?
slide38
What skills did you use in undertaking this activity?
  • Historical use …
  • How might you use it in your classroom?
  • What might you modify?