Language contact is the term used to describe the process by which two or more languages influence each other. This can happen through borrowing, code-switching, or other forms of interaction.

Creolization is not a type of language contact, but rather the process by which a pidgin language develops into a full-fledged language.

Borrowing is the term used to describe the process by which a language borrows words or phrases from another language.

Code-switching is the term used to describe the process by which two or more languages are used alternately or simultaneously by a speaker.

Pidginization is the term used to describe a simplified language that develops when two or more groups of people with different languages need to communicate.

Creolization is the term used to describe the process by which a pidgin language develops into a full-fledged language.

Changes in the environment are not a factor that can contribute to language change.

All of the above are examples of internal changes within a language.

All of the above are examples of contact-induced changes in a language.

All of the above are examples of languages that have undergone creolization.

Tok Pisin is an example of a language that has undergone pidginization.

All of the above are examples of languages that have undergone code-switching.

All of the above are examples of languages that have undergone borrowing.

All of the above are examples of languages that have undergone language shift.

All of the above are examples of languages that have undergone language death.