Answer:
Partial melting occurs when only a portion of solid is melted. It is thus enriched in the chemical components of minerals with lower melting temperatures and the remaining unmelted portion of the rock is composed of minerals with highest melting temperatures. Partial melting preferentially enriches melts with incompatible elements.
Partially melted rock do not usually experience complete melting inside the Earth, due to their different chemical composition and their melting points.
It is thought that partial-melting processes play a major role in generating more-defined liquids from less-evolved ones, so that many basalts may be the result of partial melting in the upper mantle, and many granites may have derived partly or completely from the partial melting of continental crust (anatexis).With increasing temperature and pressure, the subducted oceanic crust (of basic composition) first undergoes metamorphism and then begins to melt or release watery fluids; this material rises into the overlying mantle, which may also begin to melt, giving rise to intermediate magma.
I know that question #4 is B.) Sun
Answer:
species loss
Explanation:
it is because they are in least number . They can't produce their young one in large numbers so they are vanishing from planet earth.
Answer:
b. The terrain is mostly desert and mountains
Explanation:
Afghanistan is a country that has proved to be extremely difficult to invade, and that has been the case for thousands of years. There is one major reason for this, the geography of the country. The country is dominated by very high mountains that create rain shadow and and deserts. The mountains themselves are extremely difficult for passing through, and even if they are passed by an invading army, they will take their toll. Once the mountains are passed, an invading army would face desert, very dry climate, very few food sources and very little water, with temperatures varying from scorching hot in the summer, to freezing cold in the winter. So even if an army passes through both of these natural obstacles, when it comes to face the natives it will be too weak to invade.
