Give reason:

The equatorial low-pressure belt is an area of calm.

The equatorial pressure belt is also called doldrums (the zone of calm) because of the virtual absence of surface winds. The doldrums are caused by heating up the atmosphere by solar radiation. The heating causes the air to warm and rise above instead of blowing horizontally over the surface of the water. Those winds are light, calm and thus unpredictable. These winds result in sudden occurring cyclones. Literally, the term "doldrums" means are a state of inactivity, mild depression or stagnation.