What is the difference between a light-year and an astronomical unit?

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

How many moles does 80.0 h2o respresent

How many more valence electrons does sodium need to have a full outer valence shell