If you were asked to convert 4.2 x 1022 atoms of aluminum to moles, which of the following should you use for the conversion?

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?