A metamorphic rock can become an igneous rock through a process involving melting and solidification. When a metamorphic rock is subjected to enough heat, it can partially or completely melt, turning into molten rock known as magma. This magma, when it cools and solidifies, crystallizes to form an igneous rock. This process is part of the rock cycle and typically occurs in areas such as subduction zones, where heat from mantle material or friction melts rock, or in other geologic settings where temperatures are sufficiently high to cause melting. Thus, the transition involves metamorphic rock melting into magma followed by cooling and crystallization into igneous rock.