Surface high pressure systems in the Northern Hemisphere are generally associated with clear skies and fair weather because air is spinning around its center and its center, causing air to sink, which prevents the formation of clouds.

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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.