chapter 25.1 and 25.2 Flashcards
who came up with the continental drift hypothesis?
Alfred Wegener
what was evidence he came up with to back up his hypothesis?
- fossils from different continents matching up
- coast lines matched like puzzle pieces
- mountain ranges matched up with same rock type and ages
what was the name of the super continent?
Pangaea
who came up with Seafloor Spreading Hypothesis?
Harry Hess
how did he discover Seafloor Spreading?
by using sonar
Hess discovered what?
Hess discovered the mid-ocean ridge
what are the types of plate boundaries?
Divergent boundary, convergent boundary, and transform boundary
how do divergent plate boundary
- MOR(oceanic crust)
2. East African Rift(continental crust)
how do transform plates move
the slide side by side to each other
which earthquake boundaries have shallow earthquakes
divergent and transform plat boundaries
which boundaries have deep earthquakes
convergent plate boundaries
what are the types of stress that cause rocks to move
compression, tension, shear, torsion
what are the two types of deformation
elastic and plastic deformation
what happens to the material when elastic deformation happens
it occurs when a material, such as a rock, deforms as stress is applied, but returns to its original shape
what happens during plastic deformation
its when a material deforms, or changes shape, as a stress is applied and remains in its new shape
what type of seismic wave is the fastest
p-wave( primary wave)
what type of wave is a p-wave
it is a compression wave
what type of materials can p-waves pass through
walls, water, underground
what type of wave is a s-wave
its a transverse wave
what types of materials can an s-wave pass through
only solids
which wave does the most damage
surface waves do the most damage
which elements make up the core
iron and nickel
which elements make up the core
iron and nickel
