Chapter 12 Quizizz and Kahoot ?s
What is the mid
ocean ridge?- An undersea mountain chain where new ocean floor is produced; a divergent plate boundary
What type of crust exists in the world?
oceanic and continental
The permanent change in rocks
strain
What are P waves?
1st, fastest, & go through solids & liquids, They are push/pull waves
What are S waves?
2nd, slower, & go though solids; side-to-side waves;
What is a transform plate boundary?
Boundary between two plates that are sliding past each other
What is deformation?
Changes to the crust of the earth caused by plate tectonics.
What are the 2 types of crust that make up the earth?
Continental and oceanic
What occurs in the asthenosphere?
Convection Currents
What is the subduction zone?
Convergence of tectonic plates where one plate dives beneath another
What types of plate boundary can have a subduction zone?
Convergent
When two plates meet what controls what happens to the plates
Density of the plate
At what type of plate boundary does sea floor spreading occur?
Divergent
The area directly about the focus of the earth
Epicenter
This is the term for a break in a rock caused by motion of plates
Fault
This is where the actual plate movement/ slippage occurs (usually underground)
Focus
What gives us evidence that the continents were once together?
Fossils
The mid atlantic ridge is directly under which country?
Iceland
What does the Mercalli scale measure?
Intensity(damage done)
What does the richter scale measure?
Magnitude
What is the richter scale?
Measures the magnitude of the earthquake
Which scale uses observations to record the damage done by an earthquake?
Mercalli
Where are new rocks formed at divergent plate boundaries?
Mid-ocean ridge
Crustal deformation is caused by?
Movement of lithospheric plates
What are convection currents?
Occurs in the asthenosphere. Causes plates to move
What is Alfred Wegener famous for?
Pangea
What is a strain?
Permanent change in the shape of rocks
What happens when 2 continental plates meet at a convergent boundary
Plates collide and mountains are formed
What is a fossil?
Preserved remains that provide proof that the continents were once together
These are the most destructive waves...
R waves
What is created at a divergent plate boundary (like the mid ocean ridge)?
Rift Valley
Which type of wave can only move through solids
S Waves
What tool is needed to use the richter scale?
Seismograph
What are Love Waves?
Side to side motion surface waves
Africa used to fit into what other continents back in the pangea days?
South America
What is seafloor spreading?
Spreading of seafloor at divergent plate boundaries
An area where one plate slides under another is called?
Subduction Zone
Who was Wegner?
The man who investigated continental drift after finding fossils on opposite sides of oceans
What is a focus?
The point along a fault at which the first motion of an earthquake occurs
What is a epicenter?
The point on Earth's surface directly above an earthquake's focus
What is elastic rebound?
The snap back that causes earthquakes
What is density?
This determines how plates will interact when they collide.
The San Andreas fault is an example of what type of boundary
Transform
What are R waves?
Waves that cause the surface of the Earth to roll along with it
What is a divergent plate boundary?
Where two plates are moving apart, magma comes up to create new crust
What type of plate boundaries occur when two plates collide
convergent
What is the mercalli scale?
A scale that rates earthquakes according to their intensity and how much damage they cause at a particular place
What is a seismograph?
An instrument that records earthquake waves
What is a convergent plate boundary?
Area where earth's lithospheric plates are pushed together.
What is a fault?
A break in Earth's crust where masses of rock slip past each other
