deck ch25 Flashcards
mid-ocean- ridge (MOR)
A system of mountain ranges on the seafloor separated by valleys
rift vally
narrow depression, formed between peaks along the mid-ocean ridge
convergent plate bounday
The boundary where two plates collide
fault
crack in Earth’s crust along which rock has moved
elastic rebound
sudden release of strain energy as rock moves along a fault
focus
points of origin for an earthquake
epicenter
point on earths serface directly above the focus
Who came up with the continisal drift hypothesis?
Alfred Wegener
What where somepeases to support Wengenrs hypothesis?
- cosines mach like puzzel peaces
- found large land animle fossils
- mountin ranges mach up and the rocks are made up of the same contination and age
What wasthe name of the super continet?
Pangea
Who came up with the Sea Floor Spreding hypothesis
Hairy Hess
What did he use to map the sea floor?
Sonar
Who discorved the mid-ocean rige (MOR)
Hariy Hess
Where is the yongest rock found on the bottom of the seafloor?
Mid-ocen rige (MOR)
What are the type of plat boundurays
- divergent boundary
- convergent boundary
- transform boundary
How do convergent plat boundarys move.
They hit together
What two types of crust are involved in plate movment?
oceainc crust and continetionalcrust
What are the typeofland forms can be created when oceantic andcontinentalcrust conmuerge?
deep-sea trench and volcano
What land forms are createdwhen to oceantic cruts form?
deep-sea trench and hot spots (makes ilands)
What landforid\screatedwhen twocontanental crust conmurge?
mountains
How diverget platye boudarys move?
they devide
What are two excipalsof divergent boundarys?
mid-ocean rig (MOR) East African Rift
How do transform plate boundaeries move?
they slid by each other
What is an exsample for a transform boundary?
San Andrea fault
How does a confection curent works?
- magmen heats up, becomes less dence, rises
2. magmem cools down, becomes more dence, then seanks
What are other forces that help plate movment?
slap plate rideg push and crust
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What are the four types of stress that can be a
1.
What are the types of deformation?
- elastic
2. plastic
What happens tothe rock if elastic deformation acuras
as soon as thestress relieas it returns to its normal shape
what happens to the rock when plastic deformation apers?
as soon as the stress is releasted in remandes as the new shape
What types of seismic waves are there?
primary, scondary waves
what type of wave is a p-wave?
pramary waves
how do primary waves move?
compretion waves
What time of wave is secondary wave?
tr
What types of matieral do p-wavesmove through?
solids and liquids
What type of mutieral do s-waves move through?
only solids
Which waves couas most damig?
serfice waves
what scales are usetohelp maurch earth wakes
rictur scal mercalli scale
what do these two maurgh
mount of energy relezed and how much damiged caused
