Plate Tectonics
Published on Nov 18, 2015
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PLATE TETONICS
BY: ANNMARIE KING
1.What evidence did Alfred Wagner use to support his theory of continental drift?
Wegener found similar plant fossil's on both continents across the Atlantic ocean. This supported Alfred Wegener's theory.
Source: http://en.m.wikipedia.org/wiki/Alfred_Wegener
2. Why do you think people didn't believe continental drift theory when Wagner first explained it?
Wegener could not come up with an acceptable way to explain how the continents moved, so many people did not believe him.
https://www.smore.com/6ng1z-plate-tectonics
3. Who were the two scientist that brought forth supporting evidence to Wagner's theroy, and what was their evidence?
Author Holmes and Harry Hess helped support Wagner's theory with more information about plate tectonics.
https://www.smore.com/6ng1z-plate-tectonics
4. What are the three different types of plate boundaries, describe each type?
The different types of plate boundaries is divergent boundaries, convergent boundaries and transform boundaries.
http://pubs.usgs.gov/gip/dynamic/understanding.html
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 crust is neither produced nor destroyed as the plates slide horizontally past each other.
http://pubs.usgs.gov/gip/dynamic/understanding.html
5. Give an example of a location on Earth where each type of plate boundary is present.
Divergent boundaries-
Iceland is splitting along the spreading center between the North American and Eurasian Plates, as North America moves westward relative to Eurasia.
Photo by jackfraser
Convergent boundaries-
The oceanic Nazca Plate is pushing into and being subducted under the South American plate. This is creating the creating the towering Andes mountains in South America and generating large earthquakes in the Nazca plate.
Photo by NASA's Marshall Space Flight Center
Transform Boundaries-
San Andreas fault zone in California. It is about 1,300 km long and in places ten kilometers wide, slices through two thirds of the length of California.
Photo by Michael R Perry
6. What are the three different types of convergent plate boundaries?
The three convergent plate boundaries are Oceanic-continental, oceanic- oceanic and continental-continental.
http://pubs.usgs.gov/gip/dynamic/understanding.html
7. Give an example of a location on Earth where each type of convergent plate boundaries occure.
Oceanic- continental Convergence:
Off the coast of South America along the Peru-Chile trench
Oceanic- Oceanic convergence:
The Marianas Trench (paralleling the Mariana Islands) is a good example for oceanic- oceanic conference.
Continental- continental convergence:
The Himalayan mountain range dramatically demonstrates one of the most visible and spectacular consequences of plate tectonics.
8. Explain what plate tectonics and ocean trenches have in common?
Subduction is a similar term that both the plate tectonics and ocean trenches have in common. The process that takes place at convergent boundaries is similar.
http://pubs.usgs.gov/gip/dynamic/understanding.html
9. How old are the rocks off the east coast of North America relative to the rocks right along the mid atlantic ridge, why do you think this is the case?
Over 4.6 billion years because the age of the rock is the same as the formation of the earth.
http://www.uwsp.edu/error/Pages/404.aspx?www.uwsp.edu/geo/faculty/ritter/gl...
10. What is a convection current or cell, describe how it works?
A convection current is a internal movement of the flow of hot fluid in a circular motion caused by hearing and cooling.
http://pubs.usgs.gov/gip/dynamic/unanswered.html
11. What are the two main scouces of heat inside the Earth?
Radioactive decay and residual heat are the two main sources of the heat inside Earth.
http://pubs.usgs.gov/gip/dynamic/unanswered.html
Photo by ecstaticist
12. What types of tectonic forces create mountains?
As two continental plates push together, the stress forces them both upwards this is called converging plates.
http://www.answers.com/Q/What_types_of_tectonic_forces_create_mountains
Photo by blmiers2
13. What are horsts and grabens, and where can they be found?
A graben is a lower land being down thrown it can be seen in a valley and a Horst is a elevated block of land which can be seen as a mountain.
http://www.answers.com/Q/What_are_Horsts_and_Grabens_and_where_an_they_be_f...
Photo by WarzauWynn
14. Describe how the mountains across the Utah and Nevada were formed?
Two tectonic plates push towards each other and the stress of that makes the plates for upward creating mountains.
15. What are two bad things that can happen as a result of plate tectonics, how did plate tectonics cause these events?
Natural hazards can occur when a plate meets another plate causing things like volcano eruptions.
http://pubs.usgs.gov/gip/dynamic/tectonics.html
Photo by sama sama - massa
Earthquakes occur when two plates are pushing together and when the rock snaps it creates a vibration that shakes the ground.
www.geo.mtu.edu/UPSeis/why.html
Photo by martinluff
