Joey has a schema for the word sun, so when he looks up at the night sky and sees the bright light of the full moon, he points at the moon and says, "sun! " joey has incorporated a new piece of information into a pre-existing schema. what is this process called?

Assimilation

Explanation:

According to Piaget' constructivism theory, assimilation tends to reuse the  schema to fit the new information. This occurs or may occur when a person' experiences are in line with his internal representations of the world. When Joy sees the moon in the night sky (new information), he assimilates and incorporates it into an already existing framework (sun) without changing that framework. The pre-existing schema (sun) gets a new schema (moon) which is similar in size and Joy constructs assimilation.