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Published on Mar 20, 2016

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PRESENTATION OUTLINE

PLATE TECTONICS

BY CYRIL ABRAHAM

WHAT EVIDENCE DID WEGNER PROVIDE ABOUT HIS THEORY

  • Types or evidence found: the shape of the continents
  • Fossils that were the same on different continents.
  • Evidence of ancient climate patterns.
  • Finally matching rock types and geological structures.

WHY DIDNT PEOPLE BELIEVE WEGNERS THEORY AT FIRST

  • Most people back then might not have believe since:
  • They might not have had solid proof.
  • They might have thought that Alfred Wagner was lying.

WHO WERE THE SCIENTIST THAT BROUGHT BACK WEGNERS THEORY?

  • Arthur Holmes wasone of the men that brought this theory back to life.
  • Evidence- his idea that thermal convection in the earth's mantle could cause continents to move
  • Another person that helped with this theory was Harry Hess.
  • Hess brought forth new evidence that showed mid ocean ridges, they all helped this theory to be accepted.

WHAT ARE THE 3 TYPES OF PLATE TECTONICS?

  • Divergent boundaries -- where new crust is generated as the plates pull away from each other.
  • Convergent boundaries -- where crust is destroyed as one plate dives under another.
  • Transform boundaries -- where the crust does nothing as the plates slide horizontally past each other.
  • Plate boundary zones -- broad belts in which boundaries are not well defined and the ⏬
  • effects of plate interaction are unclear

EXAMPLE OF A LOCATION ON EARTH WHERE EACH TYPE OF PLATE BOUNDARY

  • One of the divergent boundaries is the Mid-Atlantic Ridge.
  • You can find a convergent boundary of the coast of South America along the Peru-Chile trench.
  • One trasnform boundary can be could found at the San Andreas fault zone in California.
  • One example of the plate bondary zones marks the Mediterranean-Alpine

WHAT ARE THE THREE DIFFERENT TYPES OF CONVERGENT PLATE BOUNDARIES?

  • The first one is the Oceanic-continental convergence.
  • The second one is the Oceanic-oceanic convergence
  • Finally the last one is the Continental-continental convergence

LOCATION ON EARTH WHERE EACH TYPE OF CONVERGENT PLATE BONDARY

  • The oceanic continetal can be found off the coast of South America along the Peru-Chile trench
  • The oceaninc oceanic can be found at the Marianas Trench (paralleling the Mariana Islands)
  • Finally the continetal continetal can be found on the Himalayan mountain rang

EXPLAIN WHAT PLATE TECTONICS AND OCEAN TRENCHES HAVE IN COMMON?

EAST COAST AND MID ATLANTIC ROCK AGES?

  • The rocks off of the east coast of North America are much older than those right along the mid-Atlantic ridge
  • because sea-floor spreading is occurring where oceanic plates are diverging from one another.
  • The rocks right along the ridge are the newest ones being formed, and the ones off the east coast of North
  • America were made a long ago

WHAT IS A CONVECTION CURRENT OR CELL, DESCRIBE HOW IT WORKS

  • A convection currant is a repeting current that is like this
  • Red:hot air Blue:cold air
  • The hot air goes up and then cools off and sinks down back to be heated again.

WHAT ARE THE TWO MAIN SCOUCES OF HEAT INSIDE THE EARTH?

  • Heat within the Earth comes from two source
  • radioactive decay and residual heat.

WHAT TYPES OF TECTONIC FORCES CREATE MOUNTAINS?

  • The type of tectonic forces that create mountains are called converging plates
  • As two continental plates push together, the stress forces them both upwards.

WHAT ARE HORSTS AND GRABENS, AND WHERE CAN THEY BE FOUND?

  • elongate fault blocks of the Earth’s crust that have been raised and lowered
  • respectively, relative to their surrounding areas as a direct effect of faulting.
  • One example is the death valley

HOW WERE THE MOUNTAINS ACROSS THE UTAH AND NEVADA WERE FORMED?

  • The mountains of the Great Basin were formed by plate spreading in that part of of the world.

TWO BAD THINGS THAT CAN HAPPEN AS A RESULT OF PLATE TECTONICS

  • Plate tectonics can cause earthquakes and volcanic eruptions.

THREE GOOD THINGS THAT PLATE TECTONICS PROVIDE FOR HUMANS

  • The break down of volcanic rocks provides fertille soil.
  • Metallic minerals such as gold and silver are found inside extict volcanos.
  • Finally geothermal energy can be harnessed by currently active volcanos.

SOURCES

  • The resources provided with each question.