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Igneous rocks are generally classified first on the basis of their formation (and therefore their texture) as intrusive or extrusive. Intrusive rocks are solidified from magma under the surface resulting in a visible crystalline texture, and extrusive igneous rocks are solidified from lava at or near the surface, resulting in a small or nearly invisible crystalline texture. Igneous rock can additionally be classified by general chemistry composition as felsic, intermediate, mafic, and ultramafic. Felsic rocks are higher in silica and aluminum. Mafic rocks are higher in magnesium and iron.
They form from the extremely rapid cooling of lava or magma. The quick cooling does not allow time for the crystallization of minerals, resulting in the formation of a natural glass.
The 3 kinds of textures are: * Visual texture * Artificial texture * True texture
They are references to the rock's texture.
A glassy texture.
polyphonic texture
Polyphony consists of two or more equal melodic lines.Homophony consists of one primary melody with chordal or supporting parts.Monophony consists of one melody only, although a drone or percussion may be included without affecting the texture.
polyphony
a piece with 2 or more melodic lines
It has a monophonic texture because it consists of a single melodic line. It has no harmony.
2 or more!
Polyphonic.
homophonic texture, one melodic line with accompaniment.
Simultaneous performance of two or more melodic lines of relatively equal interest produces the texture called polyphonic, meaning having many sounds. In polyphony several melodic lines compete for attention. The technique of combining several melodic lines into a meaningful whole is called counterpoint or contracanto.
homophony
They are said to have a glassy or vitreous texture.
The texture would be glass-like.