Magma

Magma
Math	hylif, carreg, sylwedd anorganig
	Ffeiliau perthnasol ar Gomin Wicimedia

Deunydd naturiol tawdd o dan wyneb y Ddaear yw magma. Mae pob craig igneaidd yn cael ei ffurfio ohono. Ar wahân i graig dawdd, gall magma hefyd gynnwys dŵr a hylifau eraill, crisialau a swigod nwy. Dim ond o dan y ddaear y mae magma i’w gael: pan ddaw allan o’r gramen drwy weithred folcanig, mae’n colli rhai o’i gydrannau anweddol fel dŵr a nwyon toddedig ac yn troi’n lafa.^[1]^[2]

Cyfeiriadau

↑ Bowen, Norman L. (1947). "Magmas" (yn en). Geological Society of America Bulletin 58 (4): 263. doi:10.1130/0016-7606(1947)58[263:M]2.0.CO;2. ISSN 0016-7606. https://archive.org/details/sim_geological-society-of-america-bulletin_1947-04_58_4/page/263.
↑ Greeley, Ronald; Schneid, Byron D. (1991-11-15). "Magma Generation on Mars: Amounts, Rates, and Comparisons with Earth, Moon, and Venus" (yn en). Science 254 (5034): 996–98. Bibcode 1991Sci...254..996G. doi:10.1126/science.254.5034.996. ISSN 0036-8075. PMID 17731523.

Eginyn erthygl sydd uchod am ddaeareg. Gallwch helpu Wicipedia drwy ychwanegu ato

[1] Bowen, Norman L. (1947). "Magmas" (yn en). Geological Society of America Bulletin 58 (4): 263. doi:10.1130/0016-7606(1947)58[263:M]2.0.CO;2. ISSN 0016-7606. https://archive.org/details/sim_geological-society-of-america-bulletin_1947-04_58_4/page/263.

[2] Greeley, Ronald; Schneid, Byron D. (1991-11-15). "Magma Generation on Mars: Amounts, Rates, and Comparisons with Earth, Moon, and Venus" (yn en). Science 254 (5034): 996–98. Bibcode 1991Sci...254..996G. doi:10.1126/science.254.5034.996. ISSN 0036-8075. PMID 17731523.

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