chapter 25 Flashcards
Hess discovered a system of mountain ranges on the seafloor separated by valleys.
mid-ocean ridge
forms in between peaks along the mid-ocean ridges
rift valley
boundary where two plates collide
convergent plate boundary
When a thick and bouynat continetal plate meets thin and dense oceanic plate,denser plate dives beneath the contiment in a process
subduction
boundary between two plates that are moving apart
divergent plate boundary
plate sides horizontally past each other in opposite directions
transform plate boundary
sudden movement or vibration of the ground
earthquake
crack in Earth’s crust along which rocks moved
fault
sudden release of strain energy as rocks moves along a fault
elastic rebound
point of origin for an earthquake
focus
point on Earth’s surface directly above focus
epicenter
Who came up with continental drift hypothesis?
Alfred Wegener
What were some pieces of evidence that support the hypothesis?
Large land animal fossils
coast lines matched up
mountain ranges matched up had the same rock compision and rock age
What was the name of the super continent?
pangea
who came up with the seafloor spreading hypothesis?
Harry Hess
What did Hess uses to help him create a map of the seafloor?
Sonor
How discovered the mid-ocean range?
Harry Hess
Where will you find younger rock?
It was closer to the M.O.R or near the M.O.R
What are the three types of plate boundaries?
divergent boundary
Convergent boundary
Transform boundary
Subduction only happens with whch type of plate number
convergent
move toward one point or approach each other
convergent
What are the two type of crust are involved in plate
oceanic crust
conitinental crust
What lands from when oceanic crust and contintemtal convert
What land forms can be formed when two oceanic crust collide?
hot spots=they create islands
What land form is created when two contentinental collide?
mountains
What type of crust must be presented from volcanoes activty to occur?
oceanic crust
How do divergent boundaries move?
they move away from each other
What are two examples of divergent plate boundaries?
M.O.R (made up with oceanic crust)
East African Rift (made up with two contentinental crust)
How do convection crust
magma hits up, becomes less dense then rises
What continental crust or involved with transform plate boudry
What other forces that help with plate motion
slab pull,ridge push,and friction
What two types of boundaries have shallow earthquakes?
Divergent and transform
Which type of boundary has deep earthquakes?
Convergent
What are the types of stress can be put on rocks?
compression stress
tension stress
shear stress
torsion stress
What are the two types of deformation?
Elastic Deformation
Plastic Deformation
What happens to a rock during plastic deformation?
it stays deformed
What are the kind of seismic waves?
primary
secondary
surface
What type of seismic waves moves the fastest?
primary
How do primary waves move?
What type of materials do waves move in?
solids and liquids
How do secoundary waves move?
What type of material do secondary waves move?
trans verse waves
what type of waves most complex and causes the most damage?
surface waves
What are the two scales that are measured earthquakes?
Richter scale
mercali scale
What does the Richter scale tell us about an earthquake?
amount of energy released
What amount of damaged was done
amount of damaged done
