Match each theory of planet formation to its best description

The gravitational instability theory suggests that planets form when gas and dust sticks to itself and collapses. The core accretion theory suggests that planets form when a core of rock and ice attracts gases.

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.

it's c.us forest service