Answer: c. Oxygen, silicon, and aluminium
Explanation:
The common elements in the Earth's crust in order of decreasing abundance are as follows:
Oxygen: Oxygen is the most abundant element on earth's crust. It makes up 46.6%. It exists as compound of the silicate minerals. It is used for industrial, commercial and medical purposes.
Silicon: Silicon is the second most common and abundant element on the earth crust. It makes up the concentration of 27.7%. It combines with the minerals of silica to form the silicate minerals. It is used for the purpose of ceramics, cosmetics, glass and other products.
Aluminium: Aluminium is the third most common and abundant element on the earth crust. It makes up the concentration of 8.1%. The aluminum exists in the form of aluminium oxide, potassium aluminium sulfate and aluminium hydroxide. It is used for the purpose of manufacture of rockets, machinery and automobiles.
Answer:
Spain by "then" will be a depopulated nation dominated by elderly and single people,the country will have lost 5.3million inhabitants, or 11% of the current population, by the middle of the century. If the trends continue, by then the over 65s will make up 34.6% of the population while close to a quarter of a million Spaniards will be over 100yrs old.By that date there will be 1.7million fewer children under 10 than there are now.....
Answer:
market...planned
Explanation:
The mixed economy types are economy types that have strong elements from both the market economies, and the planned economies. Usually, this type of economy has developed from planned economy type, but because of adaptations in order for the economy to progress and develop, lot of the elements of the market economy has been implemented as well. This results in an economy where the government is still holding onto the most important natural resources in order to provide economic security, while the private sector is also thriving and develops very well without being limited by the government, but instead having it as an economic partner. A perfect example of this is China.
It covers around 1,200,000 square miles.
https://www.britannica.com/place/West-Siberian-Plain
Answer: C) Earth’s Interior
Explanation:
