4) These 3 things are essentially the same thing (with slightly different angles).

When they have slightly different frequencies.  This is because they will fall into and out of phase, leading to constructive and then destructive interference.  This change in interference causes a pulsating nature to the volume that is called beating

Explanation:

answer: we can define a cultural region as a section of a land with cultural elements like religion, language, cuisine or architecture. cultural regions are different because its land for example can vary in size of few square miles to millions. they can also form cultural boundaries.

moreover cultural regions can be organized due to less difference between the same ethnic group. we can say also that exist three types of cultural regions such as the formal, functional and vernacular ones. for istance the formal regions refers to sharing cultural traits of people like religion or languages.

explanation: