Flu-like Illness. One of the earliest HIV symptoms in men is a severe 'flu-like' illness, known as the 'seroconversion illness.'. Seroconversion is the point in time where a person's blood is converted from being HIV negative to HIV positive, by the production of antibodies.
Erosion causes the surface of mountains to be younger than the rocks that form the mountains themselves. Glacial processes produce characteristic landforms, such as pyramidal peaks, knife-edge arÃªtes, and bowl-shaped cirques that can contain lakes.
What is altitude sickness? Altitude sickness, known as mountain sickness, is caused by a combination of two factors: the measure of elevation and how fast people climb up. It is estimated that nearly a quarter of people who go above 7,000 to 9,000 feet will develop acute mountain sickness, and that proportion will reach 42% above 10,000 feet.