Answer the following question given this paragraph: Chemical reactions are described using chemical equations. Q: How do we describe chemical reactions? Choices: - balanced reactions - equilibrium - atomic numbers - chemical equations A:
chemical equations

Answer the following question given this paragraph: Fresh water is essential for good crops. In some areas of the world, there is enough rain to accomplish this task. In other locales, water must be provided so the crops will grow. Worldwide, irrigation covers about 18% of farm land and produces some 40% of crops. A major source of cleaner water in many parts of the world is provided by the process of desalinization . Q: Which process helps provide cleaner water for agriculture? Choices: - purification - sterilization - osmosis - process of desalinization A:
process of desalinization

Answer the following question given this paragraph: If you look at a star through a prism, you will see a spectrum . The spectrum is the range of colors seen in a rainbow. The spectrum has specific dark bands where elements in the star have absorbed light of certain energies. An astronomer can use these lines to determine which elements are in a distant star. In fact, the element helium was first discovered in our Sun, not on Earth. This was done by analyzing the absorption lines in the spectrum of the sun. Q: What will you see if you look at a star through a prism? Choices: - kaleidoscope - rainbow - spots - spectrum A:
spectrum