The correct answer is A. silica.
The amount of silica found in the magma determines the viscosity. The higher the silica in magma, the higher the viscosity of a magma. So the correct answer is silica. It is not among the other choices.
Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks.
Answer:
A perfect example of fault-block mountains can be found throughout the territory of the Republic of Macedonia where every single mountain is formed in this manner.
Explanation:
The mountains can be formed in several different manners, one is by an uplift of a block of rock by a normal fault. The mountains that form in this manner are usually not very large in area, though they can reach significant heights. Many regions in the world have mountains formed in this manner, but probably the best examples are the mountains of the Republic of Macedonia.
This small country is actually the country with the highest number of mountains in the world. It has almost 60 separate mountains in its small territory. The reason for this is that it is located near the complex convergent boundary of Eurasia and Africa. All of the country's territory is divided into miniature crustal pieces with a lot of faulting. Each of the numerous mountains has formed because of the uplift of block of rock by normal faults, and they are all relatively small in area, but they range in height anywhere from around 1,000 m above sea level to over 2,700 m above sea level. Some of the mountains are Korab, Jakupica, Jablanica, Stogovo, Maleshevo Mt., Belasica, Osogovo Mt., Nidze, Kozhuf, Shar Mt., Busheva Mt., and many others.
