Lafa
Craig dawdd (magma) sy'n llifo o losgfynydd neu drwy ryw doriad arall yng nghramen y Ddaear yw lafa.
Fel arfer mae ganddo dymheredd o 800 i 1,200°C. Yn aml, gelwir y graig folcanig sy'n deillio o'r graig ar ôl iddi oeri yn "lafa" hefyd.
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| Math | magma  |
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| Deunydd | carreg |
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