Plate Boundary Theories
What have the continents done over time to form their current position?
What is shifted?
Plates colliding
Converge
The process of divergent boundaries moving apart is called?
Sea-floor spreading
Where are plate tectonics located?
Everywhere
Alfred Wegener
Plates dividing
Diverge
How many continents are there?
7
How many tectonic plate boundaries are there in Australia?
0
Sea-floor spreading was discovered by?
Harry Hess
Plates sliding
Transform
What did Harry Hess discover?
Magma was rising on the sea floor causing it to spread.
What forms on a continent during a convergent plate
Volcanoes form
Tectonic plates are able to move because the Earth's lithosphere has a higher strength than the underlying...
asthenosphere
T/F plate tectonics move metres per year
False
What is the ring of fire?
A long chain of volcanoes that surround the pacific ocean.
What is the theory of plate tectonics?
The Earth's outer crust is divided into several plates that glide over the plastic-like and less rigid upper mantle.
One example of divergent boundaries
Great Rift Valley in Africa
Plate Tectonic Movements are generated by the movement of what?
Convection currents in the mantle