Yes, with a power of attorney signed by their parents or guardians in front of a notary public, which must be duly legalized.
No, you do not need a visa, only a passport (valid for at least 6 more months at the time of travel), which enables a maximum stay of 90 days in the UAE.
The need to apply for a visa is based exclusively on the passport with which you will enter the UAE. If the country that issued your passport has a visa waiver agreement with the UAE, then you will not need to apply for a visa. On the contrary, if there is no agreement in force, then you will have to apply for one.
The document must have all the pertinent legalizations of the Argentine authorities, the last being that of the Ministry of Foreign Affairs (Chancellery), legalized -instead of apostilled. Subsequently, you must submit the document at the Embassy for its final legalization. The procedure is in-person but it is not personal. In case the document is translated, said translation must also be legalized by the Ministry of Foreign Affairs and the Embassy.
You would need to have a sponsor in the UAE who would process this permit for you. The sponsor is usually the company, the institution, or the person for whom you are going to work.
Weekend days in UAE are Friday and Saturday. The official language of the UAE is Arabic. However, in the UAE there are residents of 200 different nationalities, in addition to the fact that the Emirati people have a high level of culture and most speak other languages, especially English. The month of Ramadan is a holy month for Muslims around the world, during which Muslims abstain from eating and drinking throughout the day until sunset, and restaurants in the UAE remain closed at that time. However, it is possible to eat and drink during the day in hotels and other private establishments.
The currency of the UAE is the Emirati dirham. Since it is not possible to obtain or exchange dirhams in Argentina, it is recommended to travel with dollars or euros, which can be exchanged in the UAE to dirhams.
The time difference is 7 hours, with the UAE being 7 hours ahead.
Some medicines that are sold with or without a prescription in Argentina are restricted substances in the UAE. You can find the list on the following website: https://u.ae/en/information-and-services/health-and-fitness/drugs-and-controlled-medicines If the medicines you take are among those restricted in said list, you must obtain a medical prescription, which must have all the relevant legalizations from the Argentine authorities, the last being that of the Ministry of Foreign Affairs (Chancellery), legalized -instead of apostilled. Subsequently, you must submit the document at the Embassy for its final legalization. The procedure is in-person but it is not personal.