volcanic rock fragment

См. также в других словарях:

• Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… …   Wikipedia

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• rock — {{Roman}}I.{{/Roman}} noun 1 hard, stony part of the earth ADJECTIVE ▪ hard, solid ▪ Solid rock is broken down by weathering. ▪ soft ▪ jagged, rough …   Collocations dictionary

• Mount Cayley volcanic field — Coordinates: 50°07′13″N 123°17′26″W / 50.12028°N 123.29056°W / 50.12028; 123.29056 …   Wikipedia

• ballistic fragment — GLOSSARY OF VOLCANIC TERMS An explosively ejected rock fragment that follows a ballistic (arced) trajectory …   Glossary of volcanic terms

• Types of volcanic eruptions — In this article types of eruption will be used to refer to the mechanism causing the eruption. The style of eruption will be used to describe subcategories of eruption, which have the same eruptive mechanism. For example strombolian and vulcanian …   Wikipedia

• Mogollon-Datil volcanic field — Location Location New Mexico, USA Coordinates …   Wikipedia

• Continental fragment — Continental crustal fragments, partially synonymous with microcontinents, are fragments of continents thought to have been broken off from the main continental mass forming distinct islands, possibly several hundred kilometers from their place of …   Wikipedia

• accessory fragment — GLOSSARY OF VOLCANIC TERMS A lithic fragment composed of country rock that has been explosively ejected during an eruption (Cas and Wright, 1987, p. 54). Accessory fragments within pyroclastic deposits may be difficult to distinguish from… …   Glossary of volcanic terms

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• mountain — mountainless, adj. /mown tn/, n. 1. a natural elevation of the earth s surface rising more or less abruptly to a summit, and attaining an altitude greater than that of a hill, usually greater than 2000 ft. (610 m). 2. a large mass of something… …   Universalium