Meaning of explainable

1. The sudden disappearance of the money from the safe was not explainable.
2. The strange behavior of the cat was not explainable by its owner.
3. The mysterious lights in the sky were not explainable by any known phenomenon.
4. The sudden surge in sales was easily explainable by the new marketing campaign.
5. The complex mathematical problem was not easily explainable to the students.
6. The sudden drop in temperature was not explainable by the weather forecast.
7. The strange markings on the ancient artifact were not explainable by modern science.
8. The sudden burst of energy in the athlete was not explainable by his usual performance.
9. The strange noises in the old house were not explainable by any logical means.
10. The sudden change in his attitude was not explainable by his usual behavior.