Do you think if someone doesn't answer your question is it rude? Do they not know? Or is nobody listening?

Some people may find it rude and some may not it all depends upon people's perspective. Sometimes they may be ignoring you and giving you hint that they don't want to have a conversation with you or they may not listen properly

the aztec capital was built on a lake.

explanation:

tenochtitlan was built on lake texcoco.

hope this : )