1. Which rock sample had the most porosity? Which sample had the least? 2. How much empty space was there in the medium-sized rock sample?

3. How much time did it take the water to flow through the gravel? The sand? What about the dirt?

4. Which sample is the most permeable

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit