At around 7 months, babies begin to engage in intentional vocalizations that lack particular meaning. this form of communication contains specific vowel and consonant sounds, but it does not consist of real words. what is this vocalization called?

#1) what is this vocalization called?
Babbling. A stage in child development and a state in language acquisition during which an infant appears to be experimenting with uttering articulate sounds, but does not yet produce any recognizable words. Babbling begins shortly after birth and progresses through several stages as the infant's repertoire of sounds expands and vocalizations become more speech-like.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.