Why does some friction occur with seemingly smooth surfaces?

When molecules of water vapor in the air come in contact with a cold can of soft drink , they lose energy ,slow down, and form a liquid due to decrease in ?

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

Which statement best describes the he properties of iconic compounds ?