Sure! Here are the identified errors in the questions and their corrections:

1. **Question 3**: "How high were the tsunami waves that touched Indonesia in 2011?"
- **Correction**: Should specify "How high were the tsunami waves that touched Indonesia?"

2. **Question 6**: "How many people died in Nigeria floods?"
- **Correction**: Should read "How many people were affected by the Nigeria floods?"

3. **Question 8**: "What are the effects of Hurricane Dorian in the Bahamas?"
- **Correction**: Should read "What were the effects of Hurricane Dorian in the Bahamas?"

4. **Question 10**: "What determines the category number of a tornado?"
- **Correction**: Should specify that it pertains to hurricanes or storms, not tornadoes.

Let me know if you need further assistance!