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Published on Mar 20, 2016
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PRESENTATION OUTLINE
1.
PLATE TECTONICS
BY CYRIL ABRAHAM
2.
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.
3.
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.
4.
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.
5.
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
6.
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
7.
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
8.
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
9.
EXPLAIN WHAT PLATE TECTONICS AND OCEAN TRENCHES HAVE IN COMMON?
Oceanic trenches are formed as a result of plate tectonic movement.
This answer was found on
http://education.nationalgeographic.com/education/encyclopedia/ocean-trench...
10.
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
11.
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.
12.
WHAT ARE THE TWO MAIN SCOUCES OF HEAT INSIDE THE EARTH?
Heat within the Earth comes from two source
radioactive decay and residual heat.
13.
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.
14.
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
15.
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.
16.
TWO BAD THINGS THAT CAN HAPPEN AS A RESULT OF PLATE TECTONICS
Plate tectonics can cause earthquakes and volcanic eruptions.
17.
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.
18.
SOURCES
The resources provided with each question.
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