Sedimentary and metamorphic rocks can become igneous rocks through the process of melting and subsequent solidification. Here's how it works for each type of rock:
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Sedimentary Rocks:
- When sedimentary rocks are subjected to high temperatures and pressures, they can potentially melt. This usually occurs deep within the Earth’s crust, where the conditions are extreme.
- Once the sedimentary rock melts, it forms magma. If this magma rises to the surface and erupts, it will cool and solidify to form igneous rock, often in the form of lava.
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Metamorphic Rocks:
- Metamorphic rocks can also undergo the same melting process. When exposed to very high temperatures and pressures, they can melt to form magma.
- Similar to the melting of sedimentary rocks, if this magma makes its way to the surface and cools, it becomes igneous rock.
In summary, both sedimentary and metamorphic rocks can transform into igneous rocks through melting into magma and then solidifying, typically after volcanic activity.