Final answer:
Marble is metamorphosed limestone, formed by heat and pressure. It is usually dolomite or calcite in origin and undergoes recrystallization to become a harder rock.
Step-by-step explanation:
Marble is metamorphosed limestone. It is formed when limestone is changed by heat and pressure and recrystallizes into a light-colored rock. Marble is usually dolomite or calcite in origin and is a combination of recrystallized carbonate elements through heat, compression, or pressure to transform from one type of rock into harder rock.