Volcanic rock - Wikipedia
网页Volcanic rocks (often shortened to volcanics in scientific contexts) are rocks formed from lava erupted from a volcano. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks.
Types of volcanic rock - Science Learning Hub
网页Lava solidifies to rock. New Zealand has three main types of volcanoes, and each has been formed from a different type of magma. Once the lava has erupted, it cools and solidifies into rock: Basalt magma often forms shield volcanoes. Andesite magma often forms cone volcanoes. Rhyolite magma often forms calderas.
Volcanic Rock Types | Properties | Use - thegeotech.com
网页In this article, we’ll delve into various volcanic rock types, exploring their characteristics, formations, and applications. Volcanic rock types are igneous rocks formed through the solidification of molten magma ejected during volcanic eruptions.
岩石列表 - 维基百科，自由的百科全书
网页岩石列表 - 维基百科，自由的百科全书. 岩石 依不同的形成方式，可粗略分為三類：火成岩、沉積岩和變質岩。 火成岩 Igneous rocks. 火山岩 (Volcanic rock) 流紋岩 (Rhyolite) 黑曜岩 (Obsidian) 松脂岩 (Pitchstone) 珍珠岩 (Perlite) 粗面岩 (Trachyte) 響岩 (Phonolite) 英安岩 (Dacite) 安山岩 (Andesite) 粗安岩 (Latite/Trachyandesite) 玄武岩 (Basalt) 浅成岩 (Hypabyssal rock) 斑岩 (Porphyry) 霏細岩 (Felsite) 細晶岩 (Aplite) 偉晶岩 (Pegmatite) 玢 …
About Volcanoes | U.S. Geological Survey - USGS.gov
网页Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface. Volcanic eruptions can last days, months, or even years. What is a volcano? Redoubt volcano with minor ash eruption. Photograph taken during observation and gas data collection flight by AVO staff March 30, 2009.
Igneous and Volcanic Rock Features - Geology.com
网页Although all igneous rocks form from the solidification of molten material, they can have very different appearances and characteristics depending upon the composition of the original material and where exactly it cooled. Additional information about the igneous rock and volcanic landforms shown in this diagram can be found below.
Plate Tectonics and Volcanic Activity - National Geographic …
网页2024年4月29日 — They release a deadly mixture of lava, ash, and volcanic rocks such as scoria and pumice, which can fall kilometers away from the eruption site. They are also characterized by pyroclastic flow, a fluid mixture of fragmented materials and …
Volcanic and Extrusive Igneous Rocks - ThoughtCo
网页Updated on March 07, 2019. Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths. This means that they cool relatively quickly and under low pressures. Therefore, they are typically fine-grained and gassy.
Volcanic Rock - an overview | ScienceDirect Topics
网页Volcanic rocks are the rocks formed by erupted magma in volcanism through condensation and consolidation, compaction, diagenesis, etc. Narrowly, volcanic rocks are also known as effusive rocks [1], whose generalized conception includes magmatic deposits in an effusive channel and at the near surface.
Volcanism | Examples, Effects, & Facts | Britannica
网页2024年8月2日 — volcanism, any of various processes and phenomena associated with the surficial discharge of molten rock, pyroclastic fragments, or hot water and steam, including volcanoes, geysers, and fumaroles.