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.
Their steepness, severe terrain, and decreased oxygen at higher elevations can keep people from crossing mountains. Even on lower elevations, like in the Appalachian Mountains, the change in pressure and thinner air can affect a person's ears and breathing. 3 people found this useful.