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patrón de Widmanstätten

A pattern found in iron meteorites due to a change in crystal structure of iron-nickel metal grains during cooling. This structural change produces a pattern of crystallographically oriented kamacite (low-nickel content, usually up to 7. 5 wt% nickel) plates in taenite (high-nickel content, ~20 to 50 wt% nickel).

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Industri / Domain: Arkeologi Kategori: Evolusi

deriva genética

Changes in the frequencies of alleles in a population that occur by chance, rather than because of natural selection.

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