Ask Jimmy and the Bug
art by Dean Stanton, text by Ellen Braaf
- What affects the concentration of salt in a body of freshwater? Why? Explain your answer in a sentence or two.
[anno: The concentration of salt in a body of freshwater is affected by what kind of outlets that body of water has. If the body of freshwater does not have an outlet, the salt concentration increases as water evaporates.]
- Seawater and freshwater are a kind of mixture called a solution. In a solution, two or or more substances are so evenly mixed that the separate parts cannot be seen. As you learned in Lesson 1, a mixture is made up of two or more substances that have been physically combined. Imagine that you looked at a small part of an ocean or a small part of a lake. What kinds of things would you see in the small part of the ocean or lake? What kinds of animals, soil, and plants would would you see? Name at least five things you could see in this mixture.
[anno: Answers will vary but could include that, in a small part of an ocean, the student might see seawater, coral, fish, sand, and seaweed. In a small part of a lake, the student might see freshwater, grasses, mud, fish, and rocks.]
- Now imagine that you looked at another small part of a different ocean or a lake. How do you think the mixture of things would be different? What would make the mixture different in a different place? Explain your answer in a sentence or two.
[anno: Answers will vary but could include that the mixture of things would be different because there would be different conditions, such as depth and sunlight. Different things might grow and live in a different ocean or lake.]