Which of the following is/are characteristic of a depression in the southern hemisphere?
I. It is a mass of air whose isobars form an oval or circular shape
II. Pressure is high in the centre and decreases towards the outside
III. Air moves anti-clockwise

Depression in the southern hemisphere is a mass of air whose isobars form an oval or circular shape. In the southern hemisphere, the circular movement of winds is in a clockwise direction. Depressions are rarely stationary and tend to follow definite tracks. They are most influential over the ocean spreads and they weaken over land areas.