Craig igneaidd
From Wikipedia, the free encyclopedia
Cerrig sy'n magma (cerrig tawdd, lafa ar wyneb y daear) wedi crisialu yw creigiau igneaidd. Mae magma yn casglu o dan cramen y Ddaear ac fel arfer yn cynnwys nwy a mwynau wedi crisialu.
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| Enghraifft o'r canlynol | rock type  |
|---|---|
| Math | craig |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
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