Precipitation - any liquid or solid forms of water that fall to the ground from above, Hail - a form of precipitation with irregular lumps of ice, Condensation - the process which a substance (such as water vapor) turns from gas into a liquid through cooling., Evaporation - the process in which a substance (such as water) turns from a liquid into a gas through heating., Energy - the ability to do work or to make changes, Cold front - when a warm air mass slides over a cold air mass, Warm front - When a warm air mass moves in and pushes cold air up out of the way  , Kinetic energy - energy in motion , Potential energy - stored up energy (not in motion), Thermal energy - heat energy, Density - How tightly compact particles are in an object, Conduction - energy transferred through direct touch , Radiation - energy that is absorbed, travels in waves , Temperature higher in the sky - decreases , Warm particles - move faster, more spread out, rise/float , cold particles - move slower, closer together, sink,

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