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Grade 08 Science - EC: S8.D.1.3.2

Grade 08 Science - EC: S8.D.1.3.2

Continuum of Activities

Continuum of Activities

The list below represents a continuum of activities: resources categorized by Standard/Eligible Content that teachers may use to move students toward proficiency. Using LEA curriculum and available materials and resources, teachers can customize the activity statements/questions for classroom use.

This continuum of activities offers:

  • Instructional activities designed to be integrated into planned lessons
  • Questions/activities that grow in complexity
  • Opportunities for differentiation for each student’s level of performance

Activities

  1. True or False: 71% of Earth’s water is salt water.

  2. What term describes water that contains both fresh and salt water?
    1. Freshwater
    2. Saltwater
    3. Brackish
    4. None of the above
  1. Your teacher is doing a class demonstration. He adds freshwater and saltwater into a cylindrical container. Visually, you cannot see a difference. Describe where you will find freshwater and saltwater in the container and why.
  1. How can you differentiate saltwater and freshwater using electrical conductivity?

  2. Does freshwater contain any salt? Defend your answer.

Answer Key/Rubric

  1. True

  2. C

  3. The freshwater will be on top of the container while the saltwater will be found on the bottom. The reason being that salt water is denser than freshwater.

  4. Answers may include, but are not limited to:
    The amount of electrical current given off is directly related to the total dissolved solids, in this case salt. The more salt in the water, the greater the electrical current.

  1. Answers may include, but are not limited to:
    Yes, it does. Freshwater contains less than 1% salt. The salt in question comes from the erosion of rocks on the river beds or banks. The rocks and soil there contain small traces that, when eroded, end up in the water.

 

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