Ch 25 Flashcards
Mid-Ocean Ridge
Hess discovered system of mountain rages on the seafloor separated by valleys.
Rift Valley
A long, narrow depression.
Convergent Plate Boundary
The boundary where two plates collide.
Subduction
When a denser plate dives beneath a less dense plate.
Divergent Plate Boundary
Two plates move along a mid-ocean ridge.
Two moving plates apart
Transform Plate Boundary
Plates slide horizontally past each other in the opposite direction
Who came up with the Continental drift hypothesis.
Alfred Wegener
What were
1) Fossils(Large Land Animal Fossils)
2) Coast Line Matched Up Like Puzzle Pieces
3) Mountain Ranges Matched Up With Same Rock Types and Ages
What was the name of the Super Continent
Pangia
Who came up with the Sea Floor Hypothesis
Harry Hess
How did he discover the Sea Floor Spreading Hypothesis
Sonar
What are the types of Plate Boundaries
Divergent boundary, Convergent boundary, Transform boundary
How do Convergent Boundaries move.
They are Together
Seduction Zones only happen with what type boundaries.
Convergent
What are two types of crust
Earthquake
When a tectonic plate moves in Earths crust.
How do Divergent Plate Boundary’s move.
They divide ( They move apart)
What are some examples of Divergent Plate Boundary’s.
1) MOR (Mid Ocean Ridge)- 2 Oceanic Crust
2) East African Rift- ( 2 Continental Crust )
How do Transformed Boundary’s move.
They Slide Passed Each other.
What is a specific example of a Transform Boundary.
San Andres Fault (Continental Crust)
What is a Convection Current.
1) Magma heats up, becomes less dense and rises.
2) Magma cools down, and is more dense and sinks.
Fault
Responsibility for an accident or misfortune
crack in the earths crust.
Elastic Rebound
What happens to the crustal martial on either side of a fault during earthquake.
Focus
The center of interest or activity
Epicenter
The point on the Earths surface directly above a hypocenter or center
What plate boundary’s have sallow Earthquakes.
Divergent and Transform
What plate boundary’s have deep Earthquakes.
Convergent plate boundary’s
What are the types of stress that can apply to cause rock movement.
1) compression
2) tension
3) sheer
4) torsion
What are the 2 types of deformation.
1) Elastic
2) Plastic
What occurs to the rock/material when the Elastic Deformation happens.
The material goes back to its original shape.
What occurs to the rock/material when the Plastic Deformation happens.
It takes on a new shape.
How many types of seismic waves are there.
1) Primary
2) Secondary
3) Surface Waves
What type of seismic Wave is the fastest.
P Wave
Primary Wave
What type of Wave is a Primary Wave.
It is a compression Wave.
What type of materials can P Wave pass through.
Solids and Liquids.
What type of Wave is a S Wave.
Transverse.
What type of materials can a S Wave Pass through.
Only Solids.
Which Wave is the most Damage.
Surface Waves.
What are the 2 scales that help meauiser Earthquakes.
Richter Scale
Mercalli Scale
What does the Richter scale measure in a Earthquake.
The amount of Energy Realesed.
What does the Mercalli scale measure
Amount of measurable damage.
