But it can also be the result of a number of health conditions, such as: 1  Noise-induced hearing loss. 2  Ear and sinus infections. 3  Diseases of the heart or blood vessels. 4  MÃ©niÃ¨reâs disease. 5  Brain tumors. 6  Hormonal changes in women. 7  Thyroid abnormalities.
The Aryan Migration. Before the time of the Aryan migration into the Indian subcontinent, there was a highly developed civilization in ancient India known as the Indus Valley Civilization, which was located in what is Pakistan and northwest India today, on the fertile flood plain of the Indus River and its vicinity.he Aryan Migration. Before the time of the Aryan migration into the Indian subcontinent, there was a highly developed civilization in ancient India known as the Indus Valley Civilization, which was located in what is Pakistan and northwest India today, on the fertile flood plain of the Indus River and its vicinity.
The oldest known civilization in South America, as well as in the Western Hemisphere as a whole, the Norte Chico civilization-c. 3200 BC - 1800 BC-comprised several interconnected settlements on the Peruvian coast, including the urban centers at Aspero and Caral.he civilizations that emerged around these rivers are among the earliest known non-nomadic agrarian societies. Because Ubaid, Sumer, Akkad, Assyria and Babylon civilizations all emerged around the Tigris-Euphrates, the theory that Mesopotamia is the cradle of civilization is widely accepted.