Answer the following question given this paragraph: Plasma is a state of matter that resembles a gas but has certain properties that gases do not have. Like a gas, plasma consists of particles of matter than can pull apart and spread out, so it lacks a fixed volume and a fixed shape. Unlike a gas, plasma can conduct electricity and respond to a magnetic field. That's because plasma consists of electrically charged particles called ions, instead of uncharged particles such as atoms or molecules. This gives plasma other interesting properties as well. For example, plasma glows with colored light when electricity passes through it. You can learn more about plasma at this URL: http://www. youtube. com/watch?v=VkeSI_B5Ljc. Q: What is the state of matter that resembles a gas, but is made of ions, giving it different properties than a typical gas? Choices: - gamma - vapor - acid - plasma A:
plasma

Answer the following question given this paragraph: The process in which a liquid changes to a solid is called freezing . The temperature at which a liquid changes to a solid is its freezing point. The freezing point of water is 0C (32F). Other types of matter may have higher or lower freezing points. For example, the freezing point of iron is 1535C. The freezing point of oxygen is -219C. Q: What is the process by which a liquid changes to a solid? Choices: - melting - vaporizing - boiling - freezing A:
freezing

Answer the following question given this paragraph: There are two main types of air pollutants: primary and secondary. Most air pollutants come from burning fossil fuels. Some come from burning forests. Some are due to the evaporation of chemicals. Q: What are the two main types of air pollutants? Choices: - a and b - new and old - good and bad - primary and secondary A:
primary and secondary