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.
Mountains are formed over long periods of time by forces of the earth. Mountains just don&#8217;t appear in any place. Most are formed when plates, or. huge pieces of the Earth&#8217;s crust, pull and push against each other. Great. mountain ranges are formed by the movement of tectonic plates. Convection. currents deep in the mantle of the earth, begins to well up towards the. surface. As the pressure increases, it sets the crustal plates in motion. There are different kinds of mountains - Volcanic, Folded, Fault-block, and. Dome mountains.