Figure 1 shows how this circulation affects Australia. The high and low pressure systems each have a major influence at different times of the year. Points to remember The sun warms the earth's surface and this warms the air above. The earth's surface is warmed most near the equator, and least at the poles. The air above land is warmed more than that above water.
Winds occur because the atmospheric pressures try to 'even themselves out'.
The rotation of the earth causes the high and low pressure wind spirals. In the southern hemisphere, air from high pressure systems spirals anticlockwise, but spirals clockwise into low pressure systems. Questions Answer the following questions in the spaces provided. Air from different regions have different characteristics. Write a short story about being a weather balloon.