Answer the following question given this paragraph: Ash and particles shoot many kilometers into the sky. The material may form a mushroom cloud, just like a nuclear explosion. Hot fragments of rock, called pyroclasts , fly up into the air at very high speeds. The pyroclasts cool in the atmosphere. Some ash may stay in the atmosphere for years. The ash may block out sunlight. This changes weather patterns and affects the temperature of the Earth. For a year or two after a large eruption, sunsets may be especially beautiful worldwide. Q: What are hot fragments of rock called? A:
OPTIONS:
- obsidian
- magma
- shards
- pyroclasts

Answer: pyroclasts

Answer the following question given this paragraph: If water gets hot enough, it starts to boil. Bubbles of water vapor form in boiling water. This happens as particles of liquid water gain enough energy to completely overcome the force of attraction between them and change to the gaseous state. The bubbles rise through the water and escape from the pot as steam. Q: When water particles become hot enough to overcome the force of attraction between them, what happens to the water? A:
OPTIONS:
- it freezes
- it pools
- it evaporates
- it boils

Answer: it boils

Answer the following question given this paragraph: Electron affinity is a measure of the energy released when an extra electron is added to an atom. Q: What is the measure of the energy released when an extra electron is added to an atom? A:
OPTIONS:
- mass affinity
- neutron affinity
- volume affinity
- electron affinity

Answer:
electron affinity