The core heart( core, heart ) of the Earth is a ball of solid liquid( solid, liquid ) (inner) and liquid solid( liquid, solid ) (outer) iron and nickel.

Around the core is the mantle outer layer( mantle, outer layer ), which is semi-molten rock that moves very slowly quickly( slowly, quickly ).

The outer layer of the Earth is the crust surface layer( crust, surface layer ). The crust surface layer( crust, surface layer ) is divided into slabs called tectonic boundary( tectonic, boundary ) plates (that float on the mantle).

Plates are made up of two type of crust: continental constructive( continental, constructive ) and oceanic destructive( oceanic, destructive ).

The places where plates meet are called plate margins collisions( margins, collisions ) or plate boundaries gatherings( boundaries, gatherings ).

Destructive Constructive( Destructive, Constructive ) margins occur where two plates are moving towards each other. When a continental destructive( continental, destructive ) plate meets an oceanic plate, the oceanic plate is forced down into the mantle crust( mantle, crust ) and destroyed. When two continental oceanic( continental, oceanic ) plates meet the plates collide, fold and are forced upwards. downwards.( upwards., downwards. )

Constructive Conservative( Constructive, Conservative ) margins occur when plates are moving away from each other. This causes magma lava( magma, lava ) to rise and cool, filling in the gap and creating new crust mantle( crust, mantle ).

Conservative Constructive( Conservative, Constructive ) margins occur when plates move sideways upwards( sideways, upwards ) past each other, or move in the same direction but at different speeds pressures( speeds, pressures ). Crust is not destroyed or created destroyed or moved damaged or moved( destroyed or created, destroyed or moved, damaged or moved ).