|Assignment ID Number||AFFGEHU83939HD|
|Type of Document||Essay|
Lithosphere and The Asthenosphere Worksheet Essay Project
LEARN A CONCEPT & TEACH THE CONCEPT
For this Assignment:
You will learn about the following concepts-(link here) Plate Tectonics-Find a Fault and
Use the Canvas recorder, see icon above (Click on icon and then click RECORD)
Record yourself teaching these concepts using your voice or a video.
I will not accept work that is written. If you need to video your voice or yourself using your phone, please do so and then upload here.
Only submit a video or voice recording.
Once you have learned the concepts, please use this Assignment to truly act as though you are teaching the concepts of Plate Tectonics to your roommate, dog, friend, sibling or co-worker.
Concepts you will teach:
2A. What distinctive landforms are associated with subduction zones? Give an example of an actual location, using the site, nearest city and country.
2B. What distinctive landforms are associated with continent-continent collisions? Give an example of an actual location, using the site, nearest city and country.
3A. How do oceanic plates behave versus continental plates in a collision zone or convergent plate boundary? Give an example. Name the location.
3B. How do oceanic plates behave versus oceanic plates in a convergent plate boundary? Give an example. Name the location.
3C. How do continental plates versus continental plates behave in a convergent plate boundary? Give an example. Name the location.
PLATE TECTONICS IN A NUTSHELL
The theory of plate tectonics is a relatively new scientific concept.
While its forerunner—the theory of continental drift—had its inception as early as the late 16th century, plate tectonics only emerged and matured as a widely accepted theory since the 1960s.
In a nutshell, this theory states that the Earth’s outermost layer is fragmented into a dozen or more large and small solid slabs, called lithospheric plates or tectonic plates, that are moving relative to one another as they ride atop hotter, more mobile mantle material (called the asthenosphere).
The average rates of motion of these restless plates—in the past as well as the present—range from less than 1 to more than 15 centimeters per year. With some notable exceptions, nearly all the world’s earthquake and volcanic activity occur along or near boundaries between plates.
USING THE DIAGRAM TO DISCUSS HOW PLATE TECTONICS WORKS
To learn more about how plate tectonics work, start at the diagram (above) and explanation labeled (1). Although this diagram shows the interaction between continental and oceanic plates, the processes illustrated generally apply for the interaction between two oceanic plates.
This may requires 12 diagrams-one to diagram each plate type and one diagram to explain how it was formed.
Oceanic Versus Oceanic
Oceanic Versus Continental
Continental Versus Continental
There is another type of Plate Boundary called TRANSFORM. This is the most significant plate boundary for the Earthquakes in Southern California. Please see the below diagram. A TRANSFORM PLATE BOUNDARY occurs when two plates slip past one another-like sliding. For example the North American Plate is moving South/SouthEast while the Pacific Plate is moving North/Northwest. If you have ever driven from Los Angeles to Wrightwood or Barstow, you have crossed from the Pacific Plate to the North American Plate.
TECTONIC TIDBITS: MISCELLANEOUS SALIENT FACTS
Plate tectonics processes almost certainly have been operating since the formation of the Earth (~ 4.6 billions years ago). However, the evidence of such processes very early in Earth’s history have been masked or obliterated by younger geologic processes and deposits.
Present-day continents are much older geologically than the seafloor of present-day ocean basins. Earliest recognized and dated continental rock (in Australia) was formed about 4.3 billion years ago. In contrast, the geologically oldest seafloor formed about 180 million years ago.
Why this huge difference in geologic age between continental and oceanic rocks? Answer: the new crust formed along the ocean ridge crests is carried away by plate movement, and is ultimately “recycled” deep into the earth along subduction zones. But because continental crust is thicker and less dense than thinner, younger oceanic, most does not sink deep enough to be recycled and remains largely preserved on land.
Present-day continents are fragments of a “supercontinent” (Pangaea) that broke up about 225 million years.
There were a number of pre-Pangaea supercontinents, although the evidence becomes more and more obscure/problematic the farther back in geologic time. Pangaea itself was the product of accretion of fragments of pre-Pangaea supercontinent.
More than 80% of the world’s earthquakes and volcanoes occur along or near boundaries of the tectonic plates.
Discovery and mapping of the rugged topography (e.g., huge mountain ranges, deep canyons) and the “magnetic striping” of the ocean floor were important milestones in the development of the plate tectonics theory.
Earth is the only planetary body in our solar system that exhibits plate tectonics in action—at present as well as in the geologic past. To date, space-based planetary geological studies have not discovered any evidence of extra-terrestrial plate tectonics.
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Lithosphere and The Asthenosphere Worksheet Essay Project
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