Why is a raindrop a particularly damaging element to soil

Raindrops are considered damaging to the soil in the following ways:

If it is too wet or too dry, nutrients in the soil can run off and not make it to the plants' roots, leading to poor growth and overall health.over-watering or too much rain can also lead to bacteria, fungus, and mold growth in the soil If the average rainfall is much lower or higher than the ideal, it can lead to significant problems, from drowned crops to lower yields.The soil can also start to collect bacteria, mold, and fungus, which can then be absorbed by the plant. While this isn’t as common in crops as it is in indoor plants, poor drainage and irrigation systems can lead to these types of growths taking control over your crops.raindrops when it is excessive can lead to erosion and leaching of the soilsoil loss is mostly affected by increasing runoff discharge of rainwater                                      

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The rocks expand when there hot/warm  and contract when they are cold.