fragmented volcanic material

См. также в других словарях:

• extrusive rock — Any igneous rock derived from magma that is poured out or ejected at the Earth s surface. Extrusive rocks are usually distinguished from intrusive rocks on the basis of their texture and mineral composition. Lava flows and pyroclastic debris… …   Universalium

• pyroclastic rock — noun Any rock formed by the accumulation of fragmented volcanic material (pyroclasts) ejected during explosive eruptions …   Wiktionary

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• Indonesia — /in deuh nee zheuh, sheuh, zee euh, doh /, n. 1. See East Indies (def. 1). 2. Republic of. Formerly, Netherlands East Indies, Dutch East Indies. a republic in the Malay Archipelago consisting of 13,677 islands, including Sumatra, Java, Sulawesi,… …   Universalium

• Rock cycle — rocks do not remain in equilibrium and are forced to change as they encounter new environments. The rock cycle is an illustration that explains how the 3 rock types are related to each other and how processes change from one type to another over… …   Wikipedia

• Polystrate fossil — [ Nova Scotia, Canada (printed 1868).] Polystrate or upright fossil describes fossils of single organisms (such as tree trunks) that run through more than one geological strata. Entire fossil forests have been discovered [… …   Wikipedia

• Mount Pelée — Mount Pelee Elevation 1,397 m (4,583 ft)  …   Wikipedia

• Nature — This article is about the physical universe. For other uses, see Nature (disambiguation). Natural and Natural World redirect here. For other uses, see Natural (disambiguation). See also: Natural environment Hopetoun Falls, Australia …   Wikipedia

• Ethiopia — /ee thee oh pee euh/, n. 1. Formerly, Abyssinia. a republic in E Africa: formerly a monarchy. 58,732,577; 409,266 sq. mi. (1,060,000 sq. km). Present boundaries include Eritrea. Cap.: Addis Ababa. 2. Also called Abyssinia. an ancient region in NE …   Universalium

• Pyroclastic rock — Pyroclastic rocks or pyroclastics (derived from the Greek πῦρ , meaning fire, and κλαστός , meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked… …   Wikipedia

• Ray system — Crater ray system on the far side of the Moon (Apollo 11 image). A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The… …   Wikipedia