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100
Who proposed a hypothesis that the continents once formed a single landmass called a super-continent?
What is Wegener
100
What is the theory that came about after continental drift was rejected?
What is Plate tectonics.
100
What is the driving force behind seafloor spreading?
What is Convection
100
What causes continents to break apart?
What is Rifting
100
Where oceanic lithosphere sinks beneath continental lithosphere.
What is Subduction
200
What are hot spots? What do they show?
Shows movements of the ocean plates.
200
When the poles are in opposite places.
Magnetic reversals
200
Is the study of the magnetic properties of ancient rocks
Paleomagnetism
200
What happens during slab --- pull
cooled, dense rock moves downward into the mantle pulling the rest of the plate behind it
200
What is formed at an ocean --- Continent boundary?
Continental volcanic arcs
300
What happens at transform boundaries?
Two tectonic plates slide past each other.
300
What two things help scientist to identify the boundaries of plates?
Earthquakes and volcanoes
300
What happen at an ocean --- Ocean boundary?
One plate is subducted beneath another. Melting of materials occurs and volcanoes form on the ocean floor.
300
What is formed at ocean ridges?
New ocean floor material
300
What are the three types of plate boundaries?
Divergent, Convergent and Transform.
400
What happens during ridge push?
As rock cools it is pushed down the elevated slopes at the tip of an ocean ridge
400
What is magnetic symmetry and what is seen on the ocean floor due to the symmetry?
Matching magnetic patterns on both sides of a ocean ridge.
400
Give four key pieces of evidence that supported Wegener's theory.
Fossil evidence, Rock evidence, Climate evidence and Continental drift hypothesis.
400
What is the lithosphere and what are the segments that it is broken into? What distance do they move per year?
Crust and upper mantle. Broken into plates and the distance is about 5 centimeter per year
400
What are the four pieces of evidence for plate tectonics?
Paleomagnetism, magnetic symmetry, ages of the rock on the ocean floor and hot spots.
500
What types of earthquakes are closest to an ocean trench? What type of earthquakes are farthest from an ocean trench?
Shallow focus, deep focus
500
What can the pattern seen in deep focus earthquakes versus shallow focus earthquakes show about an ocean trench?
It shows the angle of subduction
500
What happens to the ocean cruse where a continent --- Continent boundary has formed? What is formed at continent? --- Continent boundaries?
Subducted and disappears, and complex mountain chains are formed.
500
What is the lithosphere and what are the segments that it is broken into? What distance do they move per year?
Crust and upper mantle. Broken into plates and the distance is about 5 centimeter per year
500
What is a craton? What is a shield?
Craton is large areas of stable igneous or metamorphic rocks. Shields is a craton exposed at the surface.
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