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Tefra

Tefra di South Dakota.

Tefra adalah bahan berpecahan yang dikeluarkan oleh letusan gunung berapi. Tefra dikelaskan kepada 3 jenis mengikut saiz:

  • Abu - zarah < 2 mm diameter
  • Lapili - zarah antara 2 dan 64 mm diameter
  • Bom - zarah > 64 mm diameter

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