Plate boundaries - 2 Flashcards
(15 cards)
DESTRUCTIVE
Types of crust
Oceanic + Continental
DESTRUCTIVE
Direction of movement
Away from each other
DESTRUCTIVE
Major landforms
Fold mountains, volcanoes, ocean trenches aand islands
DESTRUCTIVE
Tectonic activity
Volcanoes (explosive), Earthquakes (big)
DESTRUCTIVE
Detailed description
- denser ocean plate is subducted into the mantle crearing an ocean trench
- crust jolts and grinds it was down causing earthquakes. crust melts forming gas rich magma
- pressure increases causing the magam to rise through cracks in the crust to form composite volcanoes
- composite crust forms fold mountains
eruptios are violent
CONSERVATIVE
Types of crust
Continental and continental
CONSERVATIVE
Direction of movemnt
Along side each other
CONSERVATIVE
Major landforms
No major landforms
CONSERVATIVE
Tectonic activity
Earthquakes
CONSERVATIVE
Detailed description
-Plates move past each other or are side by side, moving at different speeds.
- Friction occurs and plates are stuck
- Pressure builds up as the plates are still trying to move.
- When the pressure is released it sends out huge amounts of energy, causing an earthquake.
- The earthquakes at a conservative plate boundary can be very destructive and they occur close to the Earth’s surface.
no volcanoes - no plates are being destroyed
CONSTRUCTIVE
Types of crust
Oceanic and continental
CONSTRUCTIVE
Direction of movement
Away from each other
CONSTRUCTIVE
Major Landforms
Ocean ridges and islands
CONSTRUCTIVE
Tectonic Activity
Volcanoes and earthquakes
CONSTRUCTIVE
Detailed description
- Convection currents in the mantle pull the plate apart.
- Tension causes the crust to crust causing an earthquake.
- Magma (under pressure in the mantle) rises through the cracks between the plates forming shield volcanoes.
- As the magma cools, new oceanic crust is formed.
