Shock metamorphism or impact metamorphism describes the effects of shock-wave related deformation and heating during impact events. The formation of similar features during explosive volcanism is generally discounted due to the lack of metamorphic effects unequivocally associated with explosions and the difficulty in reaching sufficient pressures during such an event.
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“Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark.”
—Henri-Frédéric Amiel (1821–1881)
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