Answer the following question given this paragraph: Metals such as iron are useful for many purposes because of their unique properties. For example, they can conduct electricity and bend without breaking. However, pure metals may be less useful than mixtures of metals with other elements. For example, adding a little carbon to iron makes it much stronger. This mixture is called steel. Steel is so strong that it can hold up huge bridges, like the one pictured above. Steel is also used to make skyscrapers, cargo ships, cars, and trains. Steel is an example of an alloy. Q: Adding carbon to iron makes what type of metal? Choices: - ions - titanium - plastic - steel A:
steel
Answer the following question given this paragraph: When current flows in just one direction, it is called direct current (DC) . The current that flows through a battery-powered flashlight is direct current. Q: When current flows in just one direction, what is it called? Choices: - mono-current - reactant current - alternating current - direct current A:
direct current
Q: 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? Choices: - obsidian - magma - shards - pyroclasts A:
A: pyroclasts
Question: Answer the following question given this paragraph: Q: What element is essential for amino acid and nucleic acid production? Choices: - oxygen - carbon - hydrogen - nitrogen A:
Answer: nitrogen
*Question*
Answer the following question given this paragraph: The fruiting bodies are usually produced at the surface of the food source, rather than hidden within it. This allows the reproductive spores to be easily shed and carried away by the wind, water, or animals. The fruiting bodies are usually the only indication that a fungus is present. Like icebergs, the fruiting bodies represent only a tiny fraction of the whole fungus, with most of the fungus hidden from view. Q: Where is the fruiting body normally produced in relation to the food source? Choices: - at the root - in the soil - underneath the surface - at the surface A:
**Answer**
at the surface
(Question)
Answer the following question given this paragraph: STIs are diseases caused by pathogens that spread through sexual contact. Abstinence from sexual activity and other risk behaviors is the only completely effective way to prevent the spread of STIs. Q: Stis are diseases caused by what that spread through sexual contact? Choices: - amoeba - ecosystems - parasites - pathogens A:
(Answer)
pathogens