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![Volcano Facts and Types of Volcanoes - Live Science: Scientific News, Articles and Current Events]()
www.livescience.comA volcano is a vent or fissure in Earth's crust through which lava, ash, rock and gases erupt. A volcano is also a mountain formed by the accumulation of these eruptive products. Let's take a look at how volcanoes form: Earth's crust is 40 to 250 miles (6瀏覽：1037 -
![What are volcanic rocks? - VolcanoDiscovery: volcanoes worldwide - news, info, photos, an]()
www.volcanodiscovery.comWhat are volcanic rocks?/ VolcanoDiscovery ... Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts.瀏覽：1437
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日期：2024-09-26
Find great deals on eBay for volcanic rock volcanic lava rock. Shop with confidence. ... Items in search results 8+ lbs. Oregon Obsidian Rock - Volcanic Glass Mixed Lot - Gray, Black & Mahogany $10.00 Buy It Now 32lbs WORM GOLD PLUS Organic Worm ......
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日期：2024-09-27
... free encyclopedia. Jump to: navigation, search. The main article for this category is Volcanic rock. Wikimedia Commons has media related to Volcanic rocks....
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日期：2024-09-29
Extrusive igneous rock is made from lava released by volcanoes. Basalt (an ..... Volcanic rocks are named after Vulcan, the Roman name for the god of fire....
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日期：2024-10-02
2010年4月9日 - Different types of magma are associated with different volcanoes. When the volcanoes erupt, different types of rock are formed – basalt, ......
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日期：2024-09-26
Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain clasts of other ......
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日期：2024-10-01
Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form. The specimen ......
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日期：2024-09-29
Igneous rocks—those which originate from magma—fall naturally into two categories, extrusive and intrusive. Extrusive rocks are erupted from volcanoes or ......
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日期：2024-10-01
2009年12月29日 - Volcanic rocks (also called extrusive igneous rocks) include all the products resulting from eruptions of lava (flows and fragmented debris ......
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