The process of forming the iron - rich core, the low density crust which is also rich in silicon, oxygen, aluminum, and the intermediate density mantle rich in silicon, oxygen, and magnesium is called the differentiation. Thus, the answer to this item is letter A.
Answer: Mining is an activity which the earth is dig to obtain minerals and oil reservoirs.
Explanation:
The two environmental consequences that are responsible for filling the valleys are soil erosion and downstream mining causing the contamination of the neighboring water source. Soil erosion is resultant of the mining activity causing the trees to be uprooting from their site and making soil prone to the affect of physical factors like wind and water.
The effects of the industrialization in Europe's natural environment have been devastating in lots of places. Because of this, big portion of the governments have been making reforms in order to protect the environment, as well as the health of the people.
Some of the biggest reforms have been in the usage of renewable energy, such as the solar energy, and the wind energy. Both types, the solar and wind energy, and for free, do little to no damage to the environment, and gradually in the past few decades their usage have been steadily increasing.
Some of the countries have been heavily investing in these types of energy, and that has contributed to their bigger usage, and drop in the usage of the fossil fuels. The idea is to totally replace the fossil fuels with the renewable energy in the future.