Named For A Mountain Range In South America, Which Rock Forms From Volcanic Activity There?

What is volcanic rock called?

Volcanic rock (also called extrusive rock ) is one type of magmatic rock ( igneous rocks ) and is the condensated product of extrusive magma after diagenesis and compaction, which differ greatly from sedimentary rocks in forming conditions, environments, and distribution.

How do you identify a basalt rock?

Basalt appears black or grayish-black, sometimes with a greenish or reddish crust. Feel its texture. Basalt consists of a fine and even-grain. The dense rock has no crystals or minerals discernible to the naked eye.

How basalt rock is formed?

Basalts are formed by rapid cooling of basaltic lava, equivalent to gabbro –norite magma, from the interior of the crust and exposed at or very close to the surface. These basalt flows are thick and extensive in which gas cavities are nearly absent.

Why would a plume of solid silicate rock?

Why would a plume of solid silicate rock rising slowly from deep in the mantle begin melting as it neared the base of the lithosphere? Temperatures remain high as lowered pressures decrease melting temperatures.

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What are the 3 types of volcanic rock?

There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava ) cools and solidifies.

What are the 3 main rock types?

Earth > If Rocks Could Talk > Three Types of Rock

  • Igneous rocks are formed from melted rock deep inside the Earth.
  • Sedimentary rocks are formed from layers of sand, silt, dead plants, and animal skeletons.
  • Metamorphic rocks formed from other rocks that are changed by heat and pressure underground.

What type of rock is most difficult to identify?

All rocks start out as igneous or sedimentary rocks – any and everything that can happen to those will make a metamorphic rock – so that category is the most diverse and difficult to identify.

What type of rock is white?

In rare circumstances, geologic conditions lead to an exceptionally pure limestone with no clay or sand mixed in. If a pure limestone undergoes metamorphism, a pure white marble is produced.

Is Basalt a heavy rock?

Basalt is the dark, heavy volcanic rock that makes up most of the world’s oceanic crust. Some of it erupts on land, too, but to a first approximation, basalt is an oceanic rock. Compared to the familiar granite of the continents, basalt (“ba-SALT”) is darker, denser and finer grained.

Is gold found in Basalt?

Mid ocean ridge basalt has lower gold concentration than ocean-island and volcanic-arc basalt, due mainly to lower oxygen fugacity at MOR settings that causes sulphur saturation. Gold concentrations in sedimentary rocks increase with increasing abundance of diagenetic sulphide minerals and organic matter.

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Does Basalt absorb water?

All natural stones are porous to some extent, which means they may absorb liquids and moisture if exposed. Basalt is one of the denser natural stones, as compared to a material like sandstone but can still absorb unwanted contaminants over time.

Where is basalt used?

Basalt is used for a wide variety of purposes. It is most commonly crushed for use as an aggregate in construction projects. Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes.

Which kind of eruptive activity is highly explosive?

geo quiz 6

Question Answer
Spreading center volcanism most generally produces rocks that are ________. basaltic in composition
Which kind of eruptive activity is most likely to be highly explosive? eruptions of big, continental margin, composite cones or stratovolcanoes

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Which volcanoes are sometimes very large with a gently sloping mound?

Composite, shield, cinder cones, and supervolcanoes are the main types of volcanoes. Composite volcanoes are tall, steep cones that produce explosive eruptions. Shield volcanoes form very large, gently sloped mounds from effusive eruptions.

Which magma type erupts most violently quizlet?

Which of the three types of lava has the most violent eruptions? Basaltic – Low viscosity (watery), causes non-violent eruptions. Andesitic- Medium viscosity (thicker), causes violent eruptions. Rhyolitic – Highest Viscosity (thickest), causes the most violent explosive eruptions.

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