For Tephra we have terms and definitions in 7 topics. The topics are Anthromorphemics, Anthropology, Climate, Earth Science, Geologic, Physical Geography and Volcano.

Tephra (Anthromorphemics)

Volcanic ash. In the Mediterranean, for example, deep-sea coring produced evidence for the ash fall from the eruption of Theta, and its stratigraphic position provided important information in the construction of a relative chronology.

Tephra (Anthropology)

Volcanic ash. In the Mediterranean, for example, deep-sea coring produced evidence for the ash fall from the eruption of Theta, and its stratigraphic position provided important information in the construction of a relative chronology.

Tephra (Climate)

Any rock material produced by a volcano.

Tephra (Earth Science)

Materials of all types and sizes that are erupted from a crater or volcanic vent and deposited from the air.

Tephra (Geologic)

General term for all sizes of particles ejected into the air during volcanic eruptions. Includes particles as tiny as volcanic ash and as large as bombs and blocks (= pyroclastics).

Tephra (Physical Geography)

Fragmented rock material ejected by a volcanic explosion. Also called pyroclastic material.

Tephra (Volcano)

Solid material of all sizes explosively ejected from a volcano into the atmosphere. (Teacher's Packet)
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. (Tilling, Heliker, and Wright, 1987)
See: Ash, Lapilli, Blocks, Bombs.

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