教科书式解答：
因为地壳岩层受力后快速破裂错动就会引发地表振动，简称地震。
Because the crustal rock strata are rapidly ruptured and displaced by force, they will cause surface vibration.
教养式解答：
因为小朋友如果在楼层上用力蹦蹦跳跳就会发生地震，惊吓到楼下的邻居、和小动物们。
If a baby bouncing on the floor, there will be an earthquake, and the neighbors and animals will be frightened.
答案来源是参考《牙牙双语养育》的知识百科
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