Flashcards in Plate Tectonics Deck (22):
Describe and differentiate between the Lithosphere and the asthenosphere?
Lithosphere- the outer shell of the Earth consisting of the crust and uppermost portion of the mantle
Asthenosphere- the partially melted layer of the mantle that underlies the lithosphere
List the five key pieces of evidence cited by Alfred Wegener supporting his theory of Continental drift
4)glacial striations match
5)ancient climate evidence does not match current
Name two continents that fit together very well
South America and africa
Why do the coastlines not fit together perfectly?
Why was Wegener's theory of continental drift not accepted?
it was difficult to believe that the continents moved through the solid rock of the sea floor
Differentiate between the theory of continental drift and plate tectonics
continental drift- a hypothesis that Earth's continents move on Earth's surface
Plate tectonics- the theory that the lithosphere is made of plates that move and interact with each other at their boundaries
What geological events provide evidence for plate tectonics and helps to identify plate boundaries
earthquakes and volcanoes
List the 5 plate boundaries and a resulting feature and a location where it occurs
Converging- Oceanic to Oceanic- island arc, Japan
Converging- Oceanic to Continental- volcanoes, andes mountains
Continental to continental- mountains, himalayan mountains
Diverging- mid ocean ridge, Rift Valley, mid atlantic ridge East African rift
Transform- fault, San Andreas fault
What are the three pieces of evidence for sea floor spreading?
how the continents fit together
What is a rift?
a crack or opening in earth's crust
At what type of plate boundary is a Rift Valley found?
Differentiate between a collision boundary zone and a subduction boundary zone.
collision- plates collide and fold into mountains
subduction- plates collide, one subjects below
Collision and subduction are both examples of what major boundary type?
Why, at a subduction boundary, does one plate over-ride the other?
because one is less dense than the other
Which typeof plate never subducts?
What drives plate tectonics?
True or False. Pangea began to break up about 200mya. Today the plates have all separated and in fixed positions.
False. They are not in fixed positions
Name and area of high heat flow
the ring of fire
Are fossils living things?
they once were
The fossil record of the prehistoric lizard Mesosaurus, was found on which two continents?
South America and Africa
Where would you find a trench?
A converging subduction boundary