Introduction
Have you ever noticed that the ocean water rises at certain times and moves farther away from the shore at other times? This regular change is called a tide. Tides affect coastal communities, marine organisms, fishing activities, and people's daily lives.
In this WebQuest, you will become a young ocean researcher. You will investigate how the Moon and the Sun affect ocean tides. Through online research, you will discover why tides occur and how understanding them can help people who live near the sea.
Are you ready to explore the science behind the changing ocean?
Task
Your task is to investigate the causes of ocean tides and create an informative infographic that explains how tides occur.
Your infographic must include:
- The meaning of ocean tides.
- The role of the Moon's gravitational pull.
- The influence of the Sun on tides.
- The difference between high tide and low tide.
- An explanation of spring tides and neap tides.
Use the online resources provided in this WebQuest to gather information. Present your findings in your own words and include labeled illustrations to help explain the concepts.
Process
Follow these steps to complete your WebQuest.
Step 1: Understand Ocean Tides
Visit the National Oceanic and Atmospheric Administration (NOAA) website and read about tides. Write a short definition of ocean tides in your own words.
Guide question: What causes the water level of the ocean to rise and fall regularly?
Step 2: Investigate the Moon's Influence
Research how the Moon's gravitational pull affects ocean water.
Guide question: Why does the Moon have a major influence on ocean tides?
Step 3: Explore the Sun's Influence
Learn how the Sun also affects tides and how the positions of the Sun, Moon, and Earth influence tidal patterns.
Guide question: Why can tides become more pronounced when the Sun, Moon, and Earth are aligned?
Step 4: Compare High Tide and Low Tide
Explain the difference between high tide and low tide. Draw or find an illustration that shows how the water level changes along a coastline.
Guide question: What happens to the shoreline during high tide compared with low tide?
Step 5: Discover Spring Tides and Neap Tides
Research spring tides and neap tides. Explain how the positions of the Sun, Moon, and Earth affect the strength of tides.
Guide question: Why are spring tides generally stronger than neap tides?
Step 6: Create Your Infographic
Organize the information you gathered into an infographic. Use short explanations and labeled illustrations to make your findings easy to understand.
Check that your explanations are scientifically accurate and that you identify the sources of your information.
Step 7: Present Your Findings
Present your infographic to the class. Explain what you discovered about ocean tides and describe why this knowledge is useful to people living near coastal areas.
4. Resources
Use the following online resources to complete your investigation.
- NOAA Ocean Service – What Causes Tides?
https://oceanservice.noaa.gov/facts/tides.html - NASA Space Place – What Causes the Tides?
https://spaceplace.nasa.gov/tides/en/ - NOAA Tides and Currents
https://tidesandcurrents.noaa.gov/
Use these websites to gather reliable information. If a page is unavailable, use another reliable educational or government science source. Write the information in your own words and acknowledge the sources used.
Evaluation
Your infographic and presentation will be evaluated using the following rubric.
Total: 20 points
| Criteria | 4 – Excellent | 3 – Very Good | 2 – Satisfactory | 1 – Needs Improvement |
|---|---|---|---|---|
| Scientific Accuracy | All explanations are accurate. | Most explanations are accurate. | Some explanations contain errors. | Explanations show limited understanding. |
| Completeness | All required concepts are included. | One required concept is missing. | Two required concepts are missing. | Several required concepts are missing. |
| Visual Presentation | Illustrations and labels clearly explain the concepts. | Visuals are clear and relevant. | Visuals provide limited support. | Visuals are unclear or incomplete. |
| Use of Resources | Information is supported by reliable sources and properly acknowledged. | Reliable sources are used with minor citation issues. | Few sources are used or acknowledged. | Sources are missing or unreliable. |
| Oral Explanation | Ideas are explained clearly and accurately. | Ideas are mostly clear. | Explanations lack clarity in some areas. | Explanations show limited understanding. |
Conclusion
Congratulations on completing your investigation of ocean tides! Through this WebQuest, you explored how the gravitational pull of the Moon and the Sun affects the movement of ocean water. You also learned how high tides, low tides, spring tides, and neap tides differ.
Understanding tides helps people plan coastal activities and better understand changes in the marine environment. The knowledge you gained shows how scientific investigation and online resources can help explain natural phenomena.
Before finishing, reflect on this question:
How can understanding ocean tides help people who live or work near the coast?
Write a short response based on what you learned from your research.
Credits
This WebQuest was developed for Grade 8 Science to help learners understand ocean tides and the effects of the Moon's and Sun's gravitational forces.
Information sources:
- NOAA Ocean Service – https://oceanservice.noaa.gov/facts/tides.html
- NASA Space Place – https://spaceplace.nasa.gov/tides/en/
- NOAA Tides and Currents – https://tidesandcurrents.noaa.gov/
Teacher Page
Teacher's Page
Subject: Science
Grade Level: Grade 8
Topic: Understanding Ocean Tides
Learning Objectives:
At the end of the WebQuest, learners should be able to explain how the Moon and the Sun influence ocean tides and distinguish between high tide, low tide, spring tides, and neap tides.
Estimated Time: 1–2 class periods
Materials Needed: Computer or mobile device with internet access and an infographic-making tool or paper and art materials.
Procedure: Learners will explore the provided online resources, answer the guide questions, create an infographic, and present their findings to the class.
Assessment: Learners will be assessed using the 20-point rubric provided in the Evaluation section.
Intended Outcome: Learners will demonstrate their understanding of ocean tides by explaining the causes of tides and presenting their findings through an infographic.