Not as old as those found in deeper layers
One of the main factors that unites the different nations of the Europe into a single "Eurozone" is an economic one. It is much easier for all nations to have a single currency than for each nation to have its own. This was a major unifying factor.
Mostly in the northern hemisphere
Answer: A) The decomposition of primary minerals
Explanation:
The chemical weathering is the process in which the rocks and minerals are break down by the chemical reaction. Then, it lead to the decomposition of primary minerals into other minerals.
Weathering is the chemical and physical process that change the state of chemical process in the surface of earth. Chemical weathering dissolve by the chemical process which basically form the residual materials.
This process cause rust when the iron react with the oxygen in the rocks and then it form iron oxide.