Chapter 25 Flashcards
Hess discovered a system of mountain ranges on the seafloor separated by the valleys. which he called?
Mid-ocean ridge (MOR)
A long narrow depression that forms between peak along the mid-ocean ridge. Which is called?
Rift Valley
The boundary where two plate collide is called?
Convergent plate Boundary
When a thick and buoyant continental plate meet a thin and dense oceanic plate?
Subduction
The boundary between two plates that are moving apart called?
Divergent Plate Boundary
This type of boundary where plates slide horizontally past each other in opposites is called?
Transform Plate Boundary
The sudden movement or vibration of the ground occurs.
Earthquake
A crack in Earth’s crust along which rock has moved
fault
This sudden release of strain energy and moves along a fault is called?
Elastic Rebound
The point of origin for an earthquake called?
Focus
The point on Earth’s surface directly above the focus called?
Epicenter
Who came up with the continental drift hypothesis?
Alford Wegener
What are peaces of evidence that back up Alford Wegener Evidence?
- large land animals Fossils
- Coast lines mash up
- Mountain ranges mash up with same rock type and ages
What was is the name of the super continent?
Pangaea
Who came up with the Seafloor Spreading Hypothesis
Harry Hess
How did he discovered Seafloor Spreading?
Sonar
What did Hess Discovered with Sonar
Mid-Ocean-Ridge (MOR)
What are the types of plate boundaries?
- Convergent Plate Boundary/come together
- Divergent plate Boundary /divide
- Transform Plate Boundary/Transportation
Who do convergent plate boundary move
Together
Subduction zone only happen with with type of plate boundary
Convergent Plate Boundary
What two type of crust that are use with plate boundaries
Oceanic and Continental crust
IF we have oceanic Crust and continental crust merge what will form?
Volcano’s
What will form if two oceanic crust form?
Deep sea trench or hot spots that create Chain of islands.( or vocanic Islands)
What type of land form is create if to continental crust come together.
Mountains
What type of crust be present to have a volcanic activity to occur?
Oceanic
How do divergent plate boundaries move
Move away form each other or dividej.
What is a specific example of divergent plate boundaries
1.(MOR)-two oceanic crust
how do transform plate boundaries move
They slide past each other
what is an specific example of a transform plate boundary
San Andreas Fault(Continental crust)
What is a convection current
- Magma heats up,become leas dense,and rises
2. Magma cools,becomes more dense,and sinks
What are three forces to contribute to plate motion
- Slab pull
- Ridge Push
- Friction
Which plate boundaries have shallow earthquakes
divergent and transform plate boundaries
Which plate boundary has deep earthquakes
Convergent plate boundaries
What are the types of stress that can act upon rocks movement
Compression Stress
A tensions stress
Shear Stress
Torsion stress
What are the two types of deformation
Elastic and plastic
What happen to the rock or material when elastic deformation happens
The material goes back to its original shape
What happen to the rock or material when plastic deformation happens
It takes on a new shape
How many types of seismic waves are there
- Primary-Waves
- Secondary-waves
- Surface waves
What type of seismic wave is the fastest
Primary waves
What type of wave is a primary wave
Compression wave
What type of material can p-waves pass though
Solids and liquids
What kind of waves is a secondary wave
Transverse
What kind of materials can a S-wave pass though
Solids
Which wave is the most complex and does the most damage
Surface wave
What are the two scales that helps measure earthquakes
- The Richter Scale
2. The mercalli Scale
What does the Richter scale measure about a earthquake
The Amount of energy
What does the macralli scale measure
The amount of viable damage
