Which element has an atomic number of 6

Carbon has an atomic number of 6.

The element with the atomic number of 6 is carbon

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.

if someone had the list of traits you provided