There are approximately 4000 different minerals and each of those minerals has a unique set of physical properties. These include: color, streak, hardness<span>, </span>luster<span>, diaphaneity, specific gravity, </span>cleavage<span>, fracture, </span>magnetism<span>, </span>solubility<span> and many more. These physical properties are useful for identifying minerals.
</span>
The answer is C.15, USSR broke into 15 republics including Russia itself.
<span>The answer is the option C. Altitudinal zonation. Altitudinal zonation is a graph or drawing showing the natural features of ecosystems of mountains at different heights. Several factors affect the ecosystems. On of the most basic and most used is the temperature. The infamous scientist Alexander Von Humbold was first in using the relationship between temperature and the altitude in a mountain in relation with the vegetation. Other factors related with the altitude and the ecosystems are solar radiation, soil composition and humidity.</span>
