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.
If the magma actually breaks through to the surface, you get a volcano! Mountains can also form by way of erosion. In an area with a high plateau, rivers and streams can carve away stone in the form of deep channels. Over millions of years, what is left is a mountain between deep river valleys!ne other way mountains form is as the result of volcanic activity below Earthâs surface. Sometimes molten rock called magma gets pushed up toward the surface. When that happens, it cools and forms hard rock. Eventually, the softer rock above it erodes to reveal a dome-shaped mountain below.