Inversion is turning the sole of the foot or ankle medially, and eversion is turning it laterally.
Metamorphic rock. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form. The original rock is subjected to heat and pressure, causing profound physical and/or chemical change.The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.he original rock is subjected to heat and pressure, causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.
Metamorphic rock is formed by the changing of a pre-existing rock, known as a protolith, into a new rock. The protolith, meaning 'first stone' in greek, can be igneous, sedimentary or another metamorphic rock. These changes happen without melting which is a characteristic of igneous rock formation.