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Andesite (/ ˈ æ n d ə z aɪ t /) [1] is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. [2]
Composite or stratovolcanoes often have andesitic magma and typically form the extrusive rock andesite. Andesitic magma is composed of many gases and melted mantle rocks. [2] Cinder or scoria cones violently expel lava with high gas content, [2] and due to the vapor bubbles in this mafic lava, the extrusive basalt scoria is formed. [6]
Basaltic andesite from Parícutin volcano in Mexico. Basaltic andesite is a volcanic rock that is intermediate in composition between basalt and andesite.It is composed predominantly of augite and plagioclase.
Magmatism is the emplacement of magma within and at the surface of the outer layers of a terrestrial planet, which solidifies as igneous rocks.It does so through magmatic activity or igneous activity, the production, intrusion and extrusion of magma or lava.
[1] [2] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition. Scoria has relatively low density , as it is riddled with macroscopic ellipsoidal vesicles (gas bubbles), but in contrast to pumice , scoria always has a specific gravity greater than 1 and sinks in water.
A science project is an educational activity for students involving experiments or construction of models in one of the science disciplines. Students may present their science project at a science fair, so they may also call it a science fair project. Science projects may be classified into four main types.
The final stages of eruption cap the seamount in alkalic flows. [55] There are about 100,000 deepwater volcanoes in the world, [ 56 ] although most are beyond the active stage of their life. [ 55 ] Some exemplary seamounts are Kamaʻehuakanaloa (formerly Loihi), Bowie Seamount , Davidson Seamount , and Axial Seamount .
Coding Factor Levels: Transforming the scale of measurement for a factor so that the high value becomes +1 and the low value becomes -1 (see scaling). After coding all factors in a 2-level full factorial experiment, the design matrix has all orthogonal columns. Coding is a simple linear transformation of the original measurement scale.
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