Earths SurfCe Flashcards
Whats in the inner prt of the earth called
Inner core
Whats the second layer of the erath called
Outer core
Third layer
Mantle
Outside layer
Crust
What is the crust
Outside layer
Solid rock
Mantle
Molten rock
Magma moves like currents
What is continental plates
Plates with land on top
Whats oceanic plates
Oceans on top
Explain how convection currents are formed
When magma is heated in the mantle
It rises towards the crust
As it rises it cool and moves sideways causeing fricton between crust and magma pulls playes apart
Magma cools and sinks back down
Destructive plates
Crust destroyed
Huge pressure built up
Heavier playe is subducter under light plate
Heavier plate melts back into mantle
Lighter plate lifted up forming a fold mountain eg mount andes
Constructive plates
New crust
Plates move away from eachother
Creating a gap
Magma rises out of the gap
Magma coole and hardens forming new crust
Eg iceland volcanic island
Passive boundaries
No cryst formed or destroyed
Plates locked together
Release huge amount of energy when slide past eachother
Eg san andes fault line
Mid ocean ridge
Magma rises up from mantle from cracks in the crust
Cools and harden
Builds up forming ridge of rock
Volcanic island
Mountain on seabed
Former when magma wells up through cracks in crust
Eg iceland
Volcano
Magma rises up through chamber in earths crust through vent
Lava hot ash rocks thrown into air aw volcano erupts ash cloud formation
More eruptions occur layer added onto layer cone shaped formed
Mount st helens
