premise: the formation of metamorphic rock is a sequential process, with stages of rock being compacted, heated, recrystallized sent2: marble is a kind of metamorphic rock sent3: exposure to extreme heat and pressure changes sedimentary rock into metamorphic rock sent4: if something changes into something else then that something else is formed from that something sent5: limestone is a kind of sedimentary rock.
hypothesis: marble is formed from limestone being compacted, heated, and recrystallized