Assume your science book and math book have the same mass. Your science book is on the top shelf of your bookcase, and your math book is on the bottom shelf. Which has the most gravitational potential energy? Why?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.