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  1. Ohh I got it:

    Q: Why is sand thrown on roads covered with snow?

    A: Sand is thrown on roads covered with snow because when the tracks/ roads are covered with snow there is a reduction of friction between the tires of the vehicles and the road and during this situation it is dangerous to drive. when sand is thrown on the roads covered with snow then the friction increases between the road and the tire of the vehicle, and safe driving is possible.