Notes
Two continental plates moving towards eacherth
convergent collision
Mountains and earthquakes
Convergent Collision
Why are earthquakes often stronger at a transform boundary?
The tension from the plates snagging on each other can be very forceful (sandpaper).
Where can hotspots happen?
In the MIDDLE of a plate, but NOT at a plate boundary.
Plates with different densities moving towards; one subducts
Convergent Subduction
Trench subduction; zone earthquakes, volcanic mountains, volcanic island arcs (hitting perpendicular)
Convergent Subduction
What is the theory of plate tectonics?
The theory that the Earth is broken into plates that move on convection currents.
Define Hotspot.
Big pocket of Magma underground.
Two continental plates moving away
Divergent Continental
Rifts, earthquakes, volcano (individual)
Divergent Continental
How are scientists able to track plate movement?
Satelites take global measurements of coastlines and landforms and track their sizes and movements.
What CAN happen at a hotspot or a plate boundary?
A Super Volcano.
Two Oceanic Plates Moving Away
Divergent Oceanic
Mid ocean ridge, sea floor, spreading ocean basin, earthquakes
Divergent oceanic
Why do individual volcanoes form at divergent boundaries?
Cracks in the weak crust allow magma up which forms the volcano.
Volcanic islands form in a chain as _____________.
___the plate moves over the magma.
Two plates sliding past each other
Transform
Fault/fault line, strong earthquakes
Transform
What is the difference between ridge and rift?
Ridge is under water and Rift is on land.
How do plates move?
Convection currents in the mantle.