According to Vygotsky (1978), much important learning by the child occurs through social interaction with a skillful tutor. The tutor may model behaviors and/or provide verbal instructions for the child. Vygotsky refers to this as cooperative or collaborative dialogue.
Grand Junction, Colorado is 4,593 feet (1,397 meters) above sea level.
Denver is nicknamed the Mile-High City because its official elevation is exactly one mile (5,280 ft or 1,610 m) above sea level, making it one of the highest major cities in the United States.