Ch.25 Flashcards
discovered a system of mountain ranges on the seafloor seperated by valleys
Mid-Ocean Ridge
A long narrow depression
rift valley
The boundary where two plates collide
convergent plate boundary
when a thick and buoyant continental plate meets a thin and dense oceanic plate, the denser plate dices
subduction
The boundary between two plates that are moving apart
divergent plate boundary
The type of boundary where plates slide horizontally past each other in opposite directions
Transform plate boundary
The sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in earth’s crust
Earthquake
is a crack in earth’s crust along which rock has moved
fault
this sudden release of strain energy as rock moves along a fault
Elastic rebound
The point of origin for an earthquake
focus
the point on earths surface above the focus
epicenter
Who came up with the continental drift hypothesis
Alfred Wegener
What is evidence of this theory
Wegener argued that you could match rock types
What was the name for the super continent
Pangaea
Who came up with the seafloor spreading hypothesis
Harry Hess
How did he discover it
Sonar
What is the mid-ocean ridge
A continuous mountain range
What are the 3 types of plate boundaries
convergent plate boundary, divergent plate boundary, transform plate boundary
how do convergent boundaries form
They collide together
subduction zones occur with what type of plate boundary
convergent
How do divergent plate boundaries move
Away from each other
Some examples of divergent plate boundaries
1 MOR (Oceanic and Oceanic) 2 East African Rift
how do transform plate boundaries move
Slide past each other
Specific example of transform plate boundary
San Andreas Fault (Continental Crust)
