Ridge push is a process in which the unlifted ridge is thought to push the oceanic plate towards the subduction zone. Slab pull is a process where by the weight of a subducting plate help to pull the trailing lithosphere into subduction zone. Ridge lush is cause by the potential energy gradient from the high topography. Slab pull is caused by negative buoyancy of the subducting plate.
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Lack of rain and drought is the answer.
The answer is - wind.
Wind is the most commonly used term for air movement. It is created when there's two air pressures with different values, the air that has a higher pressure always moves towards the air that has lower pressure, thus creating air movement or wind. Depending on the difference in the air pressure between the two air masses we can have winds that are very strong, standard winds, or very slow winds. The bigger the difference between the air pressures the stronger the wind is, the smaller the difference in air pressures the slower the wind is.
