You take a summer vacation by the ocean in p. e.i. you love the ocean plants you see and decide to bring some home for your fish tank. after a week or two, you notice your plants are not thriving in your freshwater tank.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.