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LAB 3 Plate Tectonics
Terms in this set (16)
Why do plates move?
Convection of the Earths Mantle raises hot rocks beneath mid-ocean ridges. These rocks spread laterally, cool, and sink back into the interior of the mantle, driving plate tectonics
Why do we care about plate tectonics?
It explains how volcanoes, islands, continents, natural hazards and oceans formed
What are the different types of plate boundaries?
Divergent,Convergent, and transformational
Define a Divergent Boundary and what is an example?
Two plates move away from one another. E.g. Mid-Ocean Ridge. East African Rift VAlley
Define convergent boundary
Due to density differences are boundaries underneath the other one causing the other one to converge
Two plates move toward eachother
Define Transform Boundary
Plates move past each-other. Generally Continental Crust. E.g.San Francisco Earthquake 1906
What is in between convergent boundaries?
How do you identify young and Old ocean floor?
Youngest rocks will be at the mid-ocean ridge and the oldest rocks will be further away
What are the different types of convergent boundaries?
Oceanic-Oceanic(Japan) Collision C-O, collision C-C (Himalayas)
How to volcanic arcs and volcanic-island arcs form?
Both form from the down-going plate reaches a certain point in the mantle, it will then turn into magma and rise to the surface.
But volcanic arcs form from a CO and a Volcanic arc island forms from a OO collision
What give us information about tectonic plates?
Seismicity because seismicity event tend to be along plate boundaries
What are Hot spots and are they proof of Plate tectonics?
Hot spots are hot plumes of magma coming from the deep mantle. No they do not.
Wha do we use hot plumes to demonstrate?
Tectonic activity because the plate will move against or over the hot spot
What plate is totally surrounded by divergent plate boundaries?
Which Plate is totally surrounded by convergent boundaries?
What plates are bound in part by the MId-Ocean Ridge?
South American and African Plate
Recommended textbook explanations
Holt Earth Science
Arthur T. DeGaetano, Jay M. Pasachoff, Mead A. Allison
Pearson Earth Science
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