Why Do Ocean Tides Change?

Introduction

Have you ever noticed that the sea level rises and falls throughout the day? Sometimes the water moves far up the shore, and at other times it pulls back. These changes are called ocean tides. In this WebQuest, you will explore why tides happen and how the Moon and the Sun affect Earth’s oceans.

Task

Your task is to:

  1. Explain what ocean tides are

  2. Describe how the Moon and the Sun cause tides

  3. Identify high tide and low tide

  4. Create one output:

    • A simple infographic, OR

    • A short written explanation (1–2 paragraphs) with a labeled diagram

Process

  • Read and watch the provided online resources about ocean tides.

  • Take notes on:

    • The Moon’s gravity

    • The Sun’s influence

    • High tide and low tide

  • Answer the guide question:

    Why do tides change throughout the day?

  • Create your final output (infographic or written explanation).

  • Review your work using the rubric before submission.

Evaluation

(Use the table tool in the editor to create this rubric.)

Criteria Excellent (4) Good (3) Fair (2) Needs Improvement (1)
Understanding of Tides Accurate and clear explanation Mostly accurate Some errors Incorrect
Use of Resources All resources used well Most used Few used Not used
Presentation Clear, neat, creative Clear Somewhat unclear Disorganized
Conclusion

Ocean tides are caused by the gravitational pull of the Moon and the Sun acting on Earth’s oceans. By understanding tides, you can better appreciate how Earth’s systems work together and how science explains everyday natural events.

 

Credits

Use the following trusted online resources:

(You may embed videos using “Insert Media Embed” in CreateWebQuest.)

Teacher Page

  • Subject: Grade 8 Science

  • Approach: Inquiry-based, constructivist

  • Technology: Internet resources, videos, digital or paper-based output

  • Assessment: Performance-based using a rubric