tephra
tephra Collective term applied to all pyroclastic particles or fragments ejected from a volcano, irrespective of size, shape, or composition. The term is usually applied to air-fall material, rather than pyroclastic flow deposits.
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Lapilli , lapilli Pyroclastic fragments or tephra ranging in size from 2 to 64 mm. Lapilli may be composed of primary magmatic material (e.g. pumice), accessor… Composite Materials , A composite material (or just composite) is a mixture of two or more materials with properties superior to the materials of which it is made. Many co… poultice , poultice •Attis, gratis, lattice •malpractice, practice, practise •Atlantis, mantis •pastis •Lettice, lettuce, Thetis •apprentice, compos mentis, in… anvil , an·vil / ˈanvil/ • n. a heavy steel or iron block with a flat top, concave sides, and typically a pointed end, on which metal can be hammered and sha… Hypopycnal Flow , hypopycnal flow Bankfull Flow , bankfull flow
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tephra