Answer:
Metamorphic rocks (from the Greek meta, change, and morphe, form, "change of shape") result from the transformation of pre-existing rocks that have undergone structural and mineralogical adjustments under certain physical or chemical conditions, or a combination of both, such as the temperature, pressure and / or chemical activity of the fluids agents of metamorphism These adjustments, imposed exclusively under the surface, transform the original rock without losing its solid state, generating a metamorphic rock. The rock generated depends on the composition and texture of the original rock, the agents of metamorphism, as well as the time in which the original rock was subjected to the effects of the so-called metamorphic process. Due to the nature of their origin, there may be a complete gradation between metamorphic rocks and the igneous or sedimentary rocks from which they were formed. The study of these rocks provides very valuable information about the geological events that occurred within the Earth and about their variation through time.
Explanation:
To classify a metamorphic rock, the type of metamorphism involved must be known, which can be variable since it depends on the criteria that are taken as a basis to differentiate it: it can be classified from the point of view of extension, fit and cause , geological value, increase or decrease in temperature, etc., but it is very common to define three main types of metamorphism according to the predominant metamorphic agent: Regional, Contact and Dynamic.
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Traditionally, a great diversity of materials have been used in the creation of African art, mostly of natural origin. Wood is the most frequent, and unusual stone. For the creation of sculptures, brass and bronze were used, while iron and iron were used for the manufacture of tools and weapons. TEXTILES Textiles, in addition to covering the body, are a symbol of social, economic or ritual prestige. The fabrics are usually made by men, who use vegetable fibers (linen, jute or raffia), cotton, silk and wool. Instead, women are responsible for decorating through embroidery or applications.
Symbol is social distinction are also bracelets, necklaces, anklets or belts. Made with glass beads, shells, feathers, mollusks ...
CLAY. Older material, known since the 9th century B.C. The land is collected on the banks of the rivers and for its modeling the lathe is not used, the pieces are made by hand. The most common technique is that of ‘churros’; overlay of long clay cylinders that will later be decorated with incisions, embossed motifs or color application with vegetable and mineral pigments. After days of drying, the objects are cooked in outdoor pits.
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Answer: Bolivia and Paraguay</h2>
Explanation:
A landlocked country is a country surrounded by land or lacking access to the sea or the ocean, and in South America there are two countries that have this characteristic: Bolivia and Paraguay.
This is considered a geographical disadvantage, as these countries must incur higher transportation costs in import and export, compared to other countries in the region. In addition, this fact separates these countries from the wealth and commercial activities that occur on the sea coast, such as fishing and maritime trade.
It should be noted that Bolivia previously had coastline and access to the Pacific Ocean, but lost this privilege in the Pacific War, which confronted it, along with Peru, with Chile.
