Answer the following question given this paragraph: Water pollution comes from many sources. One of the biggest sources is runoff. Runoff picks up chemicals such as fertilizer from agricultural fields, lawns, and golf courses. It carries the chemicals to bodies of water. The added nutrients from fertilizer often cause excessive growth of algae, creating algal blooms (see Figure below ). The algae use up oxygen in the water so that other aquatic organisms cannot survive. This has occurred over large areas of the ocean, creating dead zones , where low oxygen levels have killed all ocean life. A very large dead zone exists in the Gulf of Mexico. Measures that can help prevent these problems include cutting down on fertilizer use. Preserving wetlands also helps because wetlands filter runoff. Q: What source of water pollution picks up chemicals from the ground with water and carries them to bodies of water? Choices: - fertilizer - erosion - sediment - runoff A:
runoff
Answer the following question given this paragraph: As you can see in this NASA photo, Earth is tiny compared with the massive sun. The sun's gravity is relatively strong because the force of gravity between two objects is directly proportional to their masses. Gravity between the sun and Earth pulls Earth toward the sun, but Earth never falls into the sun. Instead, it constantly revolves around the sun, making one complete revolution every 365 days. Q: The sun's gravity is relatively strong because the force of gravity between two objects is directly proportional to their what? Choices: - tissues - Liquids - rocks - masses A:
masses
Q: Answer the following question given this paragraph: Perhaps the most familiar example of corrosion is the formation of rust on iron. Iron will rust when it is exposed to oxygen and water. The main steps in the rusting of iron appear to involve the following (Figure 17.17). Once exposed to the atmosphere, iron rapidly oxidizes. anode: Fe(s) Fe 2+(aq) + 2e . Q: Iron will do what when it is exposed to oxygen and water? Choices: - become hot - expand - contract - rust A:
A: rust
Question: Answer the following question given this paragraph: A laboratory instrument used to analyze and test for static charge is called an electroscope. Seen below, an electroscope consists of a metal knob connected by a metal stem to two very lightweight pieces of metal called leaves, shown in yellow. The leaves are enclosed in a box to eliminate stray air currents. Q: What laboratory instrument is used to analyze and test for static charge? Choices: - microscope - bunsen burner - microtome - electroscope A:
Answer: electroscope
*Question*
Answer the following question given this paragraph: Transmutation also occurs when a nucleus undergoes decay. An example of beta decay is the emission of an electron by a carbon-14 nucleus. Q: An example of beta decay is the emission of an electron by a carbon-14 what? Choices: - molecules - ion - protons - nucleus A:
**Answer**
nucleus
*Question*
Answer the following question given this paragraph: An amino acid is a compound that contains both an amino group (NH 2 ) and a carboxyl group (COOH) in the same molecule. While any number of amino acids can possibly be imagined, biochemists generally reserve the term for a group of 20 amino acids which are formed and used by living organisms. The Figure below shows the general structure of an amino acid. Q: What do you call a compound that contains both an amino group and a carboxyl group in the same molecule? Choices: - carbolic acid - compound acid - catalyst - amino acid A:
**Answer**
amino acid