How does dry ice perform this disappearing act? Why is dry ice dry?
A natural by-product of the distillation of crude oil, bitumen is a thick, gooey substance usually black or dark brown in color.
Kimberly Sessions, of Atlanta, Georgia wrote to A Moment of Science with the following question: “I know why the ocean is still salty: evaporated water leaves the salt behind. But how did it get salty in the first place?”