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Metamorphic Rocks

Metamorphic Rocks Explained Simply

Metamorphic rocks form when existing rocks (igneous or sedimentary) are transformed by intense heat and pressure, often during events like mountain-building or tectonic plate collisions. These forces change the rock’s texture, structure, or mineral composition without melting it.

How They Form

  • Heat: From deep Earth or nearby magma.
  • Pressure: From overlying rocks or tectonic forces.

Common Examples

Original Rock

Metamorphic Rock

Clay/Shale

Slate

Limestone

Marble

Sandstone

Quartzite

Granite

Gneiss

Shale

Schist

Coal

Graphite

Key Features

  • Foliated: Layered/banded (e.g., slate, schist, gneiss).
  • Non-foliated: No layers (e.g., marble, quartzite).

Why They Matter

  • Used in construction (marble for statues, quartzite for countertops).
  • Provide clues about Earth’s history (e.g., mountain formation).

Fun Fact: The word “metamorphic” comes from Greek, meaning “change form”! 🌟

 

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