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.
Most mountains form at places where the Earth's plates move towards one another and the planet's crust is subjected to immense forces. For example, the Himalayas formed when the Indo-Australian plate and the Eurasian plate collided. As one plate moved below the other, what is modern day India and central Asia came together and were forced upwards creating 'fold mountains'.