ANIMALS
over 250
BIRDS
over 500
FLOWERS
over 225
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ANIMALS over 250 |
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BIRDS over 500 |
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FLOWERS over 225 |
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ANIMALS over 250 |
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BIRDS over 500 |
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FLOWERS over 225 |
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Our
Beautiful World
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| Solid material of all sizes explosively ejected
from a volcano into the atmosphere. Tephra is the general term now used by volcanologists for airborne volcanic ejecta of any size. Historically, however, various terms have been used to describe ejecta of different sizes. Fragmental volcanic products between 0.1 to about 2.5 inches in diameter are called lapilli; material finer than 0.1 inch is called ash. Fragments larger than about 2.5 inches are called blocks if they were ejected in a solid state and volcanic bombs if ejected in semi-solid, or plastic, condition. See: Ash, Lapilli, Blocks, Bombs. and Airborne Lavafragments |
Tefra = gresk, betyr bokstavelig aske. All vulkansk masse, untatt gass og lava, hører inn under gruppen tefra, som omfatter alle utbruddsstykker som f.eks.: aske, sand, grus og stein (lapilli), blokker, bomber, og Pele's hår. |
