If a gold bar is 16,000 g mass and 800 cm^3 volume what is the density?

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

How to calculate the mass of copper

What physical property of gold makes panning a useful way to get gold from streams?