Question 1. Construct a crossword puzzle of your own using the keywords. (Chapter - 18 Pollution of Air and Water)

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

In "the pig," what is the main effect that the piglet initially has on kibuka?

Which describes the changes in the earths motion?