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tipo de enlace del Ácido metasilícico o H2SiO3 ???

Polar covalent  

Explanation:

The bonds in metasilicic acid — H₂SiO₃ — are all polar covalent.  

There is one Si=O double bond.

There are two Si-O single bonds. Each of the O atoms is attached to an H atom by a covalent bond.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

the dissolution of polymer can be thermodynamically described in 2 steps.