Lesson 1-Processes/key elements of plate tectonics Flashcards
1
Q
What has long been thought responsible for plate movement?
A
Mantle convection
2
Q
How is the lower mantle heated?
A
The decay of radioactive elements in the core
3
Q
In which direction do convection currents move in?
A
Circles
4
Q
Where abouts are the convection currents?
A
The Asthenosphere
5
Q
What occurs when mantle convection cells make contact with the base of the crust?
A
The plates are moved by frictional drag
6
Q
What combination is likely when driving tectonic plate movement?
A
Convection and Gravity
7
Q
What does Gravity cause to happen to the oceanic Crust
A
The denser Oceanic crust is to be pulled down at the site of subduction
