Answer:
》Planetary differentiation《
In planetary science, planetary differentiation is the process of separating out the different components within a planetary body as a consequence of their physical or chemical behavior (e.g. density and chemical affinities). The process of planetary differentiation is mediated by partial melting with heat from radioactive isotope decay and planetary accretion. Planetary differentiation has occurred on planets, dwarf planets, the asteroid 4 Vesta, and natural satellites (such as the Moon).
Answer:
Correct answer is often formed on the dry side of mountain ranges.
Explanation:
First option is not correct as sand is covering only 20 percent of deserts, while plants can survive in desert even for a large period of time without water.
Second option is also not correct. Deserts can be found everywhere. In Asia, Africa, Australia...
Third option is correct. Mountains are blocking rainy weather, that would allow the growth of plants.
Last option is not correct. We can find deserts in cool areas.