Chapter 9 study guide .

What was the name of the supercontinent ?
Pangaea, meaning all land
What did Wegener argue must have once been joined based on fossils ?
South America and Africa must have been joined
What does rock evidence exists in the form of ?
Rock evidence for continental drift exists in the form of several mountain belt that end at one coastline, only to reappear on a landmass across the ocean
Where were areas of glacial til found ?
LAYERS of glacisl til were found in Southern Africa and South America, as well as India and Australia.

It is interesting that much of the land area that shows evidence of these glaciations now lies near the equator in a subtropical climate

What could Wegener not describe ?
Wegener could not describe a mechanism that was capable of moving the continents across the globe
What is the new theory known as ?
The new theory was known as plate tectonics. This theory provides the framework for understanding most geologic process, such as the information of the mountains
What are the segments of the lithosphere called ?
What are the segments driven by ?
The movement is driven by the unequal distribution of heat within Earth. Hot material found deep in the mantle moves slowly upward as part of Earth’s internal convection system
What are also called spreading centers ?
Divergent boundaries
What happens at convergent boundaries ?
Two plates move together
What is the example of a transform plate boundary ?
Transform plate boundaries are margins where two plates grind past each other without the production or destruction of lithosphere
What are two things continuously add oceanic lithosphere ?
Spreading and upwelling of magma continuously adds oceanic lithosphere
What is the longest physical feature of Earth’s surface ?
The system of ocean ridges is the longest physical feature on Earth’s surface.
What is the process by which new oceanic lithosphere is produced ?
Seafloor spreading is the process by which plate tectonics produces new oceanic lithosphere .
What are subduction zones ?
Destruction plate margins where oceanic crust is being