When people visit another country they sometimes feel disoriented and are unable to depend on their taken-for-granted assumptions about life. this disorientation is known as: ?

This disorientation is known as "culture shock".
Culture shock is something that has a tendency to be clowned about yet it's a genuine wonder and one that can deeply affect individuals experiencing it. Culture shock is for the most part characterized as a feeling of disorientation or inconvenience because of the newness of the earth. The push to adjust to the new condition causes pressure, and there might be a feeling of misfortune in what has been abandoned in the past condition.