Definition:

Metamorphic rocks are rocks that have changed form due to heat and pressure. They were originally igneous, sedimentary, or other metamorphic rocks before undergoing transformation.

Formation Process:

Metamorphic rocks form deep within the Earth’s crust where temperatures are high, and pressure is intense. The minerals in the rock change shape or form new minerals without melting.

Examples of Metamorphic Rocks:

• Marble: Formed from limestone.

• Slate: Formed from shale.

• Schist: A rock with layers of minerals, often sparkly.

• Gneiss: A rock with distinct banding or stripes.

Characteristics:

• Hardness: Many metamorphic rocks are harder than the original rock.
• Texture: Some have foliated (layered) textures, while others are non-foliated.
• New Minerals: Heat and pressure can form new minerals in the rock.

Uses of Metamorphic Rocks:

• Marble is used in building and sculpture.

• Slate is used for roofing and flooring.

The Rock Cycle:

Metamorphic rocks are part of the rock cycle. They can be eroded into sedimentary rocks or melted to form igneous rocks.

Location:

Metamorphic rocks are found in mountain ranges and deep within Earth’s crust where tectonic plates collide.

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