How does sedimentary rock become metamorphic and then igneous?

Answer 1

A quick example: Near shore sedimentary is subducted due to the collision of tectonic plates. The sedimentary rock gradually becomes slate from low grade metamorphism due to heat and pressure. The slate then becomes a higher grade metamorphic rock, like schist. If the increase in heat and pressure continue with subduction, the rock will eventually melt. If the product of this melt is erupted by a volcano or becomes a plutonic extrusion and solidifies, it will form an igneous rock.

Answer 2

Sedimentary rock is made into igneous rock when it melts into magma. When a volcano erupts it spews out the magma, which as it cools and crystallises forms igneous rock. This then gets buried under more and more rock, which causes immense pressure and heat, which causes it to turn into metamorphic rock, such as marble, (which is actually the metamorphic rock of granite).

Answer 3

Sedimentary rock becomes metamorphic when it is subjected to high heat and pressure, causing the rock to recrystallize and change its mineral composition. Metamorphic rock can then melt and become igneous through the process of partial melting and subsequent cooling and solidification.

Answer 4

The igneous and metamorphic rocks will have to undergo erosion into grains that settle and become sedimentary rock (with time and pressure).