How can a metamorphic rock change into another type of metamorphic rock?

metamorphic rock type
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How can a metamorphic rock change into another type of metamorphic rock?

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“Metamorphic rock is the result of the transformation of an existing rock type, the protolith, in a process called metamorphism, which means “change in form”. The protolith is subjected to heat and pressure (temperatures greater than 150 to 200 °C and pressures of 1500 bars) causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.” Source and further information: http://en.wikipedia.

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