All ____1______ has heat. Heat is a form of ____2______ which causes particles in an object to ____3______ . The ____4______ the particles of an object vibrate, the ____5______ the object will be. Because particles of an object are always moving, heat ____6______ is always happening. Heat always flows in the same direction: from ____7______ areas to ____8______ areas. Heat transfer will stop once two objects reach the same ____9______. This is known as thermal equilibrium. There are three keyways that heat transfers. With ____10______ objects, heat transfers when the objects come into direct ____11____ with other things. This is known as ____12______. Liquids and gases are different. Because these two states of matter flow, or are ____13______, heat transfer happens when warmer, ____14______ dense particles rise and cooler, ____15______ dense particles sink. This ongoing process is known as a ____16______ current. Heat can also be transferred through space (distance) in the form of ____17______. This process is known as ____18______. All objects give off, or ____19______, some heat. All objects also take in, or ____20______, heat.