Which rock is an example of metamorphic rock?

• A. Granite
• B. Marble
• C. Basalt
• D. Limestone

Answer: (B)

Metamorphic rocks form when existing rocks are transformed by heat and pressure. Marble fits this description because it is produced when limestone is subjected to metamorphic conditions, causing the calcite minerals to recrystallize into a new, interlocking crystalline texture. This change happens without melting, which is a key feature of metamorphic rocks. In contrast, granite and Basalt are igneous rocks formed from cooling molten rock, and Limestone is sedimentary, formed from accumulated shells and other calcium carbonate sediments. So Marble is the metamorphic example.