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.
Explanation:
Fatores religiosos e sociais influenciaram muito a cultura do continente africano, embora a África mantenha muitas de suas tradições, muitas pessoas de outros países europeus ou americanos vieram com o objetivo de evangelizar, aprender e implementar novas formas de cultura social. .
Agora, a África também recebeu contribuições econômicas e políticas de países mais desenvolvidos, permitindo um grande progresso em todos esses campos nos últimos 50 anos.
Minerals can be classified as many things such as...idealizes,sulfates, silicates,carbonates,sulfides and oxides
The humanist scholarship encouraged oceanic exploration as due to the large-scale printing of books, people started gaining knowledge and setting out on oceanic expeditions in order to find new trade routes and satisfy their spirit of adventure.
The factors which motivated the Portuguese, particularly Prince Henry the Navigator, to explore west Africa were to extract and export gold and other valuables from which Portugal could benefit. The other reason was that Prince Henry was fascinated about west Africa as the Portuguese had little knowledge about it.
With the development of the printing press, books were available more easily and were even cheaper. This help in the widespread of new ideas and thoughts in society. People built sturdier ships with this knowledge and set out to explore new oceanic routes to procure spices and other goods at cheaper prices from different parts of the world.
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