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.
The uplifted part forms a mountain, and the lowered parts are filled in with eroded material. An example of this is the Sierra Nevada mountain range in California. Another way that mountains are formed is when magma from beneath the Earthâs surface is pushed up, but doesnât actually crack through.This bulge of magma eventually cools and hardens into hard rock, like granite. The layers of softer rock above the magma erode away and youâre left with a large dome-shaped mountain.he mountain ranges are created because of those crumpling plates. The Indian subcontinent âcrashedâ into Asia 25 million years ago and created the Himalayan mountain range. In fact, the Himalayans are still growing! The next way that mountains are formed is along fault lines.