The Theory of Plate Tectonics
According to Wegener, what is the name of the supercontinent when all land was together
Pangea
What is the lithosphere made of?
What is the asthenosphere made of?
Lithosphere - hard solid rock
asthenosphere - semi-solid rock or rock which acts like a liquid
What are the three main types of boundaries?
Convergent, Divergent, and Transform
List two types of divergent boundaries
oceanic/oceanic
continental/continental
About how many plates are there?
15
What is the last layer of the earth?
inner core
What is the type of boundary which often causes earthquakes?
Transform
List three types of convergent boundaries
continental/continental
oceanic/oceanic
oceanic/continental
What is the scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements… explains phenomena such as earthquakes, volcanic eruptions, mountain building”
plate tectonics
What causes the asthenosphere to move?
Convection currents
”the border between two tectonic plates” is a
Boundary
What is a landform created at a continental/continental convergent boundary?
Mountain/Mountain ranges
What evidence was there which explained the theory of plate tectonics?
Plates fitting together like puzzle pieces and FOSSILS!!
Why is the asthenosphere important to plate tectonics?
It moves causing the plates which float on top to move - it's why there is plate motion!
What type of landform is created at an oceanic/continental convergent boundary?
Volcanoes
Trenches
True or False: Earthquakes happen at each type of boundary?
TRUE!
Who is given credit for coming up with the theory of plate tectonics
Alfred Wegner
Which layer do scientists think creates earth's magnetic field?
the OUTER CORE
What type of boundary split Africa and South America apart?
Divergent
What is the landform created at a continental/continental divergent boundary?
A rift valley.