1 / 30

Lithospheric Plate Boundaries

Lithospheric Plate Boundaries. Plate Tectonics Part 2. WHAT CAUSES TECTONIC ACTIVITY ?. CONVECTION – internal heat of the Earth rises RADIOACTIVE DECAY – of Uranium (Ur), Thorium (Th) or Potassium (K) VULCANISM CONDUCTION

yamka
Download Presentation

Lithospheric Plate Boundaries

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lithospheric Plate Boundaries Plate Tectonics Part 2

  2. WHAT CAUSES TECTONIC ACTIVITY ? CONVECTION – internal heat of the Earth rises RADIOACTIVE DECAY – of Uranium (Ur), Thorium (Th) or Potassium (K) VULCANISM CONDUCTION Other planets have no tectonic activity because they have already cooled

  3. Movements of Plates

  4. Make a pattern of colored stripes with markers

  5. TYPES OF PLATE BOUNDARIES • Divergent Margins • Convergent Margins • Transform Margins • Hot Spots

  6. DIVERGENT BOUNDARIES • Places where 2 (or more) plates are moving apart • Most found on ocean floor • As plates separate, narrow “rift” valley forms • Ex.- Mid Atlantic Ridge, Red Sea, p 249

  7. CONVERGENT BOUNDARIES • Place where 2 (or more) plates move toward each other, collide • Types 1 Oceanic-Continental crusts 2 Continental-Continental Crusts 3 Oceanic- Oceanic Crust

  8. 1. Oceanic-Continental Crust • Oceanic crust is more dense (basalt) • It is forced under the continental crust (granite) • Forms deep ocean trench, volcanic mountains • Ex.- Peru Trench, Andes Mountains, Cascade Mtns

  9. 2. Continental-Continental Crust • Since both plates are of equal density, neither goes under (gets subducted) • Plates crumple • Form uplifted mountains • Ex.- Himalayan Mtns.

  10. 3. Oceanic-Oceanic Crust • Bigger plate forces other under • Deep ocean trenches form and volcanic island arcs • Ex.- Marianas Trench, Aleutian Islands

  11. TRANSFORM BOUNDARIES • 2 or more plates slide past each other • Plates do not slide smoothly-earthquakes • Scrape and move in spurts • Ex.- San Andreas Fault

  12. HOT SPOTS • Small, long lasting, extremely hot area in the middle of a plate • Provides local source of energy for volcanism • Plate continues to move, creating new island or feature above hot spot, geysers • Ex.- Hawaii, Emperor Sea Mounts, Yellowstone N.P.

  13. Geysers

  14. Illustration of Main Boundaries

  15. Why do plate move? • Convection Currents

  16. Natural Hazards • Earthquakes • Volcanoes • Tsunamis

  17. Natural Resources • Fertile Soil • Ore Deposits • Fossil Fuels • Geothermal Energy

More Related