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Normally the ground is still but sometimes the ground shakes. Do you know what to do when the ground shakes? ປົກກະຕິ ດິນຈະບໍ່ເຄືອນໄຫວ ແຕ່ບາງຄັ້ງກໍ່ມີການເໜັງຕີງ. ເຈົ້າຮູ້ຈັກແຜ່ນດິນໄຫວບໍ່? Your purchase of this book supports Library For All in its mission to make knowledge available to all, equally.