Earthquakes
These are caused by sudden movements in the earths crust
What is an Earthquake?
Three of the four layers of the earths crust
What are inner core, outer core, mantle, and crust?
This was the name of the supercontinent that existed 300 million years ago
what is Pangaea?
What is seafloor spreading or continential drift?
Define a divergent boundary
What is a boundary where two plates are moving apart?
This detects earthquake vibrations
What is a Seismograph?
The difference between layers of the earth
What is chemical composition?
This is the theory that explains how mountains were formed millions of years ago
What is continental drift?
The number of major and minor plates
What is seven or eight major plates and many minor plates?
What are two results of divergent boundaries?
What are rift valleys on land and mid-oceanic ridges under the sea?
These are the two types of seismic waves an earthquake can have
What are P-waves and S-waves?
What are physical states and mechanical properties?
An important conclusion of the seafloor spreading hypothesis?
What is the creatio?
These two things occurs at plate tectonic boundaries
What is intense volcanic activity and seismic activity?
A transform boundary has this kind of motion
What is horizontal motion? Or what is plates sliding past each other?
An area of the earth that does not recieve certain waves
This is one of the most dynamic layers of the earth
The D" layer
The vertical movements of the lithosphere
What are subsidence and uplift?
This is how plates move according to plate tectonics
What are convection currents?
Subduction zones are...
What is the part of a convergent boundary where the denser plate is subducted underneath a less dense plate?
This happens when seismic waves travel through layers of the earth
This part of the earths core is solid
What is the inner core?
What are magnetic stripping hypothesis and seafloor spreading hypothesis?
These two cause convection currents
What are gravity and heat flow?
The Himalayan mountains are an example of this kind of convergent boundary
What is an obduction zone?