A student wants to know how many students send text messages during lunch at his school. The best way for him to gather this inf
ormation would be to A. text his friends during lunch and ask them if they have been texting. B. pass out a survey to every student in the school with questions about text messaging. C. try to watch every table in the cafeteria and make a note when he sees someone's cell phone. D. randomly pick tables in the cafeteria and ask how many people have sent text messages during lunch.
<h3>Bottom line: When charged particles from the sun strike atoms in Earth's atmosphere, they cause electrons in the atoms to move to a higher-energy state. When the electrons drop back to a lower energy state, they release a photon: light. This process creates the beautiful aurora, or northern lights.</h3>
There's a few differences. In a physical change the actual substance doesn't change, where in a chemical change with chemical reaction, a new substance is formed. Physical change can be reversed, and chemical change can't.