Which metamorphic rock is formed from limestone under heat and pressure?

Which metamorphic rock is formed from limestone under heat and pressure?

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

Answer: (C)

Metamorphism is the process by which existing rocks are transformed by heat and pressure into new rocks with different textures and properties. Limestone, a sedimentary rock made mainly of the mineral calcite, when buried and exposed to elevated temperatures and pressures, recrystallizes its calcite grains into a new, interlocking crystal structure. That transformation yields marble, a non-foliated metamorphic rock known for its dense, uniform crystalline texture and often smooth appearance. The other rocks mentioned come from different origins: granite and basalt are igneous rocks formed from cooled molten material, and sandstone is a sedimentary rock made from cemented sand grains. Marble specifically forms from limestone under heat and pressure.

Metamorphism is the process by which existing rocks are transformed by heat and pressure into new rocks with different textures and properties. Limestone, a sedimentary rock made mainly of the mineral calcite, when buried and exposed to elevated temperatures and pressures, recrystallizes its calcite grains into a new, interlocking crystal structure. That transformation yields marble, a non-foliated metamorphic rock known for its dense, uniform crystalline texture and often smooth appearance. The other rocks mentioned come from different origins: granite and basalt are igneous rocks formed from cooled molten material, and sandstone is a sedimentary rock made from cemented sand grains. Marble specifically forms from limestone under heat and pressure.