Theory of Plate Tectonics
____ currents inside Earth might drive plate motion.
Convection
In which boundary type do plates move away from each other?
Divergent
The Andes mountain range of South America was formed at a ____.
convergent boundary
Plates move apart at ____ boundaries.
divergent
In what way does the transform boundary differ from the other three boundary types?
At a transform boundary, the plates move in a direction that is parallel to the boundary line.
Which type of plate boundary would be most likely to lead to above-ground volcanic activity?
Convergent
What is the difference between a convergent and a divergent plate boundary?
Convergent plates move together; divergent plates move apart.
What kind of boundary is shown in the image below?
Divergent
In what direction does warmer material move in a convection current?
In a convection current, the warmer material rises.
What type of boundary occurs along the mid-ocean ridge?
The mid-ocean ridges are along divergent boundaries.
Why are there few volcanoes in the Himalaya?
The plates that are colliding to form the Himalaya are crumpling, but usually no subduction is occurring. Volcanoes form at subduction zones.
How were the Andes mountain range, the Himalayas, and the Appalachian Mountains similarly formed?
They were all formed at convergent boundaries.
The Himalayas formed when two continental plates collided. What type of boundary is this?
convergent
The place where two plates come together is known as a
convergent boundary.
Active volcanoes are most likely to form at ____.
convergent oceanic-continental boundaries
According to the figure above, what type of plate boundary occurs between the Nazca Plate and the South American Plate?
convergent oceanic-continental plate boundary
According to the figure above, what type of plate boundary occurs between the North American Plate and the Eurasian Plate?
divergent boundary
The Great Rift Valley in Africa is a ____.
divergent boundary
A collision between two pieces of continental crust at a converging boundary produces a
mountain range.
Technological methods used to prove that plate tectonics occur include:
ocean floor mapping and satellite images
The result of plate movement can be seen at ____.
plate boundaries
A ____ forms where two oceanic plates collide.
subduction zone
The ____ is (are) an example of a transform boundary.
San Andreas Fault
Plates slide past one another at ____.
transform boundaries
A place where two plates slip past each other, moving in opposite directions, is known as a
transform boundary.