I know it hard for people these days to get points so here are soMe points

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.

What happens when the vapor pressure of a liquid is equal to the external pressure?