CH 25 Flashcards
System of mountain ranges on the sea floor separated by valleys
Mid-Ocean Ridge
A Long Narrow Depression
Rift Valley
The Boundary Where Two Plates Collide
Convergent Plate Boundary
When a thick buoyant continental plate meets a thin and dense oceanic plate, the denser plate dives beneath the continent
Subduction
The boundary between two plates that are moving apart
Divergent Plate Boundary
Type of boundary where plates slide horizontally past each other in opposite directions
Transform Plate Boundary
Sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in the Earth’s crust called faults
Earthquake
Crack in earth’s crust along which rock has moved
Fault
Sudden release of strain energy as rock moves along a fault
Elastic Rebound
The point of origin for an earthquake
Focus
The point on earth’s surface directly above the focus
Epicenter
Who came up with the continental drift hypothesis
Alfred Wegener
Name of the super continent
Pangaea
how do conversion plates boundaries move
They collide
which plate boundaries have shallow earth quakes
what types of stress can be applied to rocks to cause movement
compression stress
A tension stress
a shear stress
torsion stress
what are the types of deformation that can be caused due to stress
elastic and plastic deformations
what happens to a material when elastic deformation happens
deforms and snaps back to original form
what happens to a plastic deformation
Deforms and remains in that shape
how many types of seismic waves are there
Three
which wave moves at a faster pace
P waves
what type of wave is a Pwave
what types of material can s waves travel through
Only solids
what are the names of the two scales used to measure earth quakes
The Richter and The Mercalli scales
