What metamorphic rock does chalk turn into?
it becomes a shale rock.
There is no way that chalk, a form of limestone, can be metamorphosed into shale. It will like limestone change to marble.
A Metamorphic Rock could turn into a sediment rock by heat and erosion. Then the sediment rock could turn into a Sedimentary Rock by compaction and cementation. The Sedimentary Rock can turn into a Metamorphic Rock again by heat and pressure. Metamorphic Rock (weathering and erosion Sediment Rock Sediment Rock (compaction and cementation)= Sedimentary Rock Sedimentary Rock (Heat and Pressure) = Metamorphic Rock
Lava does not directly turn into metamorphic rock. Lava turns into igneous rock, which can become sedimentary rock. Either igneous or sedimentary rock can turn into metamorphic rock when lava gets into a crack. The pressure and heated fluids alter the surrounding rock, turning it into metamorphic rock.