enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Lithophysa - Wikipedia

    en.wikipedia.org/wiki/Lithophysa

    A lithophysa (plural lithophysae, from Greek lithos "stone" + physan "to blow") [1] is a felsic volcanic rock with a spherulitic structure and interior cavity with concentric chambers. Its outer shape is spherical or lenticular.

  3. Volcanic rock - Wikipedia

    en.wikipedia.org/wiki/Volcanic_rock

    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. For these ...

  4. Glossary of geology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geology

    Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...

  5. Vug - Wikipedia

    en.wikipedia.org/wiki/Vug

    A vug, vugh, or vugg (/ v ʌ ɡ /) [1] is a small- to medium-sized [quantify] cavity inside rock. It may be formed through a variety of processes. It may be formed through a variety of processes. Most commonly, cracks and fissures opened by tectonic activity ( folding and faulting ) are partially filled by quartz , calcite , and other secondary ...

  6. Space volcanoes have erupted on dark side of moon for over a ...

    www.aol.com/news/space-volcanoes-erupted-dark...

    Two independent teams of scientists identified volcanic rock fragments that are approximately 2.8 billion years old. One fragment, however, is even older, dating back to about 4.2 billion years.

  7. Vesicular texture - Wikipedia

    en.wikipedia.org/wiki/Vesicular_texture

    Vesicular texture is a volcanic rock texture characterized by a rock being pitted with many cavities (known as vesicles) at its surface and inside. [1] This texture is common in aphanitic, or glassy, igneous rocks that have come to the surface of the Earth, a process known as extrusion. As magma rises to the surface the pressure on it decreases ...

  8. A volcano in Jackson? It's true. Could what has happened in ...

    www.aol.com/volcano-jackson-true-could-happened...

    In the 1900s, deep drilling brought up warm water and volcanic rock. He said the top of it sits about 4,000 feet underground. It probably last erupted toward the end of the Cretaceous period which ...

  9. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Trachybasalt – Volcanic rock – A volcanic rock with a composition between basalt and trachyte Hawaiite – Volcanic rock – a sodic type of trachybasalt, typically formed by ocean island volcanism; Trachyte – Extrusive igneous rock – A silica-undersaturated volcanic rock; essentially a feldspathoid-bearing rhyolite