Hi it's E 75 again and in this unit I learned that matter is made up of little particles!  Also, I learned that when something gets warm that means particles are moving very fast, and bumping into each other. Then we learned about  expansion and contraction. Like when a bridge has those jaws that is so that the bridge can expand. We also learned about convection. Convection is when a furnace heats up a room. also called a convection current. We also learned about radiation, radiation is when you heat something up in the microwave.Lastly we learned about conduction! conduction is when you heat something up on a stove. My favorite thing this year was when we  did  the popcorn experiment. I did not like well i liked everything!!!! What is conduction??