When the vapor pressure of a liquid is equal to the atmospheric pressure the liquid?

The Nature of Liquids

1) Intermolecular attractions is the key difference between a liquid and a gas

2) the temperature of the remaining liquid Decreases when some of the liquid evaporates

3) it is the equal to the rate of condensation

4) the liquid begins to boil when the vapor pressure of the liquid is equal to the pressure of the atmosphere

~GENERAL OUT~

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.