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The Rock Cycle_HERO

The rock cycle

The rock cycle

  • Exhibition Text

    • The rock cycle takes eons. It strongly affects the carbon and other geochemical cycles by locking up critical elements for tens to hundreds of millions of years. Over the age of the Earth, some rocks have passed many times through the complete cycle. The igneous (granite), sedimentary (claystone), and meta-morphic (gneiss) rocks shown here represent stages in this cycle.

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  • For Educators

    • Topic: Earth Science

      Subtopic: Earth Formation/Evolution

      Keywords: Geochemical cycles, Geochemistry, Rocks

In This Section

Granite

Granite

This igneous rock formed when molten material intruded into the shallow crust, where it cooled and crystallized.

Claystone

Claystone

Weathering and erosion of rocks like granites concentrate elements that are necessary to form clay minerals, which accumulate as sediments.

Gneiss

Gneiss

With burial and the associated increase in pressure and heating, shales may be transformed by re-crystallization in the deep crust into metamorphic rock, like this gneiss. 

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