CH 25 Flashcards
a range of a mountain in the sea
mid ocean ridge
peakes at the mid ocean ridge
rift valley
the boundary where two plates collide
covergent plate boundary
the denser plate
subduction
horizontally plates passing eachother but opposite direction
transform plate boundary
two plates moving apart
divergent plate boundary
a sudden movement or vibration of the earth
earthquake
a crack of the earth’s crust
fault
sudden release of strain energy to a fault
elastic bound
were the earthquake starts
focus
the point on earth surface directly above the focus
epicenter
whats the 3 peices of evidence?
cost line match up like a puzzle
found large animal fossils
mountain ranges match up and the rocks are made up as the same composition and age
what was the name of the super continent?
pangaea
who cameup with the Seafloor Spreading Hypothesis?
Harry Hess used sonar
who discovered the mid-ocean ridge?
Harry Hess
Where at the bottom of the sea is the youngest rock found?
near the MOR
what are the types of plate boundries?
divergent convergent and transform
What two types of crust are involved in plate movement?
oceanic crust and contintental crust
what types of land forms when oceanic and contintental crust converge?
valcanoes
what can be created when two oceanic crusts converge?
deep see trench
hotspots (land)
what landforms are created when two continental crusts form.
mountains
how do divergent plate boundries move?
they seperate
what are the two examples of divergent plate boundries?
MOR (oceanic only)
how do tranform plate boundaries move?
moves horizontally
what types of plate boundaries have shallow earthquakes
divergent and transform
which plate boundary has deeper earthquakes?
convergent plate boundaries
what are the four types of stress that rocks have?
compression stress
tension stress
shear stress
torsion stress
what are the types of deformation?
elastic deformation
plastic deformation
what happens to the rock if elastic deformation occurs?
soon as stress is released it returns to its original shape
what happens to the rock if plastic deformation occurs
when stress is released it remains in the same shape
what type of seismic waves are there?
primary waves
secondary waves
surface waves
what type of material can s- waves move through
only solids
what are the two scales that help us measure earthquakes?
merricelli
ritcher
what does the rictor scle measure?
the amount of energy released
what did marcalli cause
damage
