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.
Before Wegener developed his theory, it was thought mountains formed because the Earth was cooling down, and in doing so contracted.This was believed to form wrinkles, or mountains, in the Earth's crust. If the idea was correct, however, mountains would be spread evenly over the Earth's surface.egener's evidence for continental drift was: 1  The same types of fossilised animals and plants are found in South America and Africa. 2  The shape of the east coast of South America fits the west coast of Africa, like pieces in a jigsaw puzzle.