Please enable JavaScript.
Coggle requires JavaScript to display documents.
PLATE BOUNDARIES (CONSTRUCTIVE (two plates DIVERGE in a process called SEA…
PLATE BOUNDARIES
CONSTRUCTIVE
-
-
-
as magma DIVERGES the lithospere is pulled apart, causing TENSION at the centre of the ridge
this causes FAULTS and are marked by SLUMPING BLOCKS, forming a rift valley
magma eventually RISES from the mantle to fill the gaps, creating new oceanic crust - BASALT
-
-
COLLISION
-
due to CONVECTION CURRENTS, the plates converge
-
edges of the plates and FOLDING of marine sediment compress together to form layers of CRUST which buckles UPWARDS
the sediment continues to RISE, forming mountains in NEPAL and TIBET
NO VOLCANIC ACTIVITY: however, BATHOLITHS can form due to intense heat
-
CONSERVATIVE
-
-
-
-
-
on the SA fault, the parts are moving in the same NW direction but at different SPEEDS
pacific plate is moving faster than NA plate and in 25m years, LA and San Fran will be beside each other
DESTRUCTIVE
CONTINENTAL and OCEANIC
-
-
-
-
this drags down the edge of the CONTINENTAL plate forming a deep ocrean TRENCH e.g. Peru-Chilie Trench
-
-
this tension is released in a JOLTING movement known as an earthquake. they can be shallow, intermediate or deep.
oceanic plate is MELTED into ASTHENOSPHERE and is LIGHTER than the surrounding rocks so moves UPWARDS to the underside of the CONTINENTAL plate
this molten material may pierce through lines of WEAKNESS in the plate, forming VOLCANOES
these may form in a LINEAR pattern, PARALLEL to the ocean trench
-
OCEANIC and OCEANIC
-
-
this drags down the leading edge of the LIGHTER oceanic plate, forming a DEEP OCEAN TRENCH
it continues to be SUBMERGED, building up tension in an area known as the BENIOFF zone
-
the plate is MELTED into the asthenosphere and is LIGHTER than the surrounding rocks so it moves UPWARDS to the underside of the oceanic crust
it may pierce through lines of WEAKNESS into the plate and form an ISLAND ARC of VOLCANOES or SUBMARINE VOLCANOES that form in a LINEAR pattern, PARALLEL to the ocean trench