10. what are metamorphic rocks? what two factors primary metamorphic metamorphism? regional metamorphism? what environmental generate rocks? what is contact is foliation?

Metamorphic rocks being the third great class of rocks found in environment full of pressure pressure and strain.

Explanation:

Metamorphic rock is the transformation of the existing rocks through a process of metamorphism i.e change in forms. It is subjected to heat at 200 degrees that causes profound chemical and physical changes.  The primary or contact metamorphism is the name given to the process that takes place in the magma when injected the surrounding solid rocks as temperatures are highest at the boundaries.  Temperature and pressure are the most primary factors, regional metamorphism also called the dynamic metamorphism is the name given to the changes in the rock types due to the greater depths are subjected to horizontal tectonic pressure thus giving a gneissic type texture where minerals ten to the subject in bands. Foliation is the form when pressure squeezes the flat and elongated rock minerals, which develops into sheets reflecting the direction of pressure.

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

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