The cover letter could have been more informative and slightly more formal. Question "What do you think is the worst result of natural disasters?" lacks more answer options or could at least have "other". In your cover letter you indicate that you are interested to see if people know about the results of natural distasters. Questions like "How much do you know about how natural disasters are formed?" do not necessarily help to reach your research objectives. Other than that, this was a good attempt to create an Internet survey!
I do not have anything particular in my mind about this survey
Intresting and easy questions to answer, you can also find important information about natural disasters.
I think it's well done because it remains generic but you can understand a lot looking at the answers