Yes africa si south of anartica
It means that people will know if they are suffering from an illness, meaning that they have the advantage of being able to treat it. A disadvantage could be that if a disease is inactive or uncurable the person would be put through stress for no reason.
It increases with distance from the ocean ridges.
The two most obvious ones are on the far right, and near the far left. Oceanic lithosphere is descending into the earth's mantle at these places, and being destroyed. ... At convergent boundaries oceanic lithosphere is always destroyed by descending into a subduction zone
