Which of the following changes igneous or sedimentary rock into metamorphic rock?

a.) heat and pressure
b.) heat and weathering
c.) water and weathering
d.) water and pressure

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image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.