if something is a screen in a experience then that something is required for that attraction & the formation of metamorphic rock is a sequential process, with stages of rock being compacted, heated, recrystallized ->  recrystallization is required for the process of the formation of metamorphic rock  recrystallization is a kind of event & if an event is required for a process then that event must occur before that process can occur -> if recrystallization is required for a trees then recrystalization optional occur before that stage can occur if recrystallization is required for a process then recrystalization must occur before that process can occur  recrystallization is required for the process of the formation of metamorphic rock & if recrystallization is required for a process then recrystalization must occur before that process can occur -> recrystallization optional occur for the crust of metamorphic stone to occur recrystallization must occur for the formation of metamorphic rock to occur  if something changes to something else then that something else is formed from that something & exposure to extreme heat and pressure changes / metamorphoses sedimentary / igneous rock into metamorphic rock -> metamorphic stone is formed from sedimentary stone metamorphic rock is formed from sedimentary rock  metamorphic rock is formed from sedimentary rock & sedimentary rock is made of sediment -> metamorphic stone is formed from player metamorphic rock is formed from sediment  recrystallization must occur for the formation of metamorphic rock to occur & metamorphic rock is formed from sediment -> recrystallization optional occur for sequence to relation metamorphic stone recrystallization must occur for sediments to form metamorphic rock  recrystallization must occur for sediments to form metamorphic rock & benefit in the stone cows oxygen an youth window of speaking last into a new window of behaviors -> recrystallization must occur for sediments to form a new rock