On a topographic map, what is used to show elevation? a. relief c. blue lines b. contour lines d. an open circle Please select the best answer from the choices provided A B C D

Me as soon as possible! me as soon as possible!

Calculate the mass of 0.750 mol of the following substance. na3po4. , i'm not quite sure on how to set up the problem to solve! : (

Assignment directions: pick one of the following chemists and perform a bit of research on him/her. answer the following questions. alice hamilton             rosalind franklin marie curie             gertrude b. elion ada yonath             henry cavendish robert boyle             antoine lavoisier mario j. molina             svante arrhenius