How do i incorporate collaborative learning in teaching the 7 continents of the world?

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.

The caste system in india was used for what purpose? a) to ensure that all people had an adequate income b) to prevent the rich from taking too much power c) to provide social control and conformity according to one’s birth d) to draft a military capable of defending india from mongol invasion

Above is the big island of hawaii. if the sea levels rise by a couple of inches, predict what changes will coconut on the island (list 3-4)