Metamorphic rock 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 (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure ( or more), causing profound physical or chemical change. The protolith may be a sedimentary, igneous, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by texture and by chemical and mineral assemblage (metamorphic facies). They may be formed simply by being deep beneath
Rock (manga) is often presented as a considerably more complex antagonist than many of Tezuka's other villains (who are usually bad people simply because that's what they've always been and always will be), and his actions are sometimes explained by a rough past (in the manga Nextworld, "Metropolis" and the newest "Astro Boy" series, for example). Rock often appears as either a heroic major or protagonist character, such as in "Adventures of Rock" and "Princess Knight" TV Series (as Prince Frank, Sapphire's love interest), or as an antagonist whose brutal means often have justified motives through the storyline (such as in "Phoenix"