Introduction
Imagine arriving at a beach in the morning and seeing a wide stretch of exposed sand, only to return several hours later and find that the water has covered much of it. The sea appears to move in and out according to a hidden schedule. Fisherfolk, sailors, coastal engineers, tourists, and communities living near the shore depend on understanding this pattern. In this WebQuest, you will become part of a Coastal Science Investigation Team tasked with explaining why tides occur, recognizing their patterns, and using reliable online information to prepare a practical tide advisory.
Task
Working in a group of four, investigate the causes and patterns of ocean tides and prepare a digital "Coastal Tide Advisory" for a selected coastal community. Your final product must contain: (1) a clear explanation of how the Moon, Sun, and Earth's rotation influence tides; (2) a labeled diagram showing high and low tides; (3) a comparison of spring and neap tides; (4) a tide-data table or graph from a reliable source; (5) a prediction or interpretation based on the data; and (6) three safety or planning recommendations for coastal users. Present the advisory as a five- to seven-slide presentation, one-page infographic, or three-minute narrated video.
Process
Step 1 - Form the Investigation Team
Create a group of four and assign the following roles: Science Explainer, Data Analyst, Visual Designer, and Source Evaluator/Presenter. All members remain responsible for understanding the complete output.
Step 2 - Activate Prior Knowledge
Discuss what you already know about tides. Write two initial explanations for why sea level rises and falls and one question that your group wants the investigation to answer.
Step 3 - Investigate the Science
Use the NOAA and NASA resources below to study the regular rise and fall of sea level, lunar and solar gravitational effects, Earth's rotation through tidal bulges, and the formation of spring and neap tides. Record key ideas in your own words and identify at least two misconceptions that the sources correct.
Step 4 - Examine Tide Data
Open an official tide-prediction page and select one coastal station. Record the predicted times and heights of at least two high tides and two low tides within a 24- to 48-hour period. Organize the information in a table and, when possible, convert it into a simple line graph.
Step 5 - Interpret and Apply
Explain the pattern shown by the data. Identify the highest and lowest predicted water levels, estimate the tidal range, and discuss how the information may affect fishing, boating, swimming, coastal travel, or community safety.
Step 6 - Create the Coastal Tide Advisory
Combine your scientific explanation, diagram, comparison, data display, interpretation, and recommendations into the selected final format. Cite every online resource and use only images that are openly licensed, public domain, or properly credited.
Step 7 - Peer Review and Revision
Exchange drafts with another group. Use the evaluation rubric to give one commendation and two specific suggestions. Revise the advisory before submission.
Step 8 - Present and Reflect
Present the final product to the class. Each member must answer at least one question. Individually complete the conclusion reflection after the presentation.
Evaluation
| Criterion | Points | Full-Credit Description |
| Scientific Accuracy and Depth | 25 | Explanations of tidal causes, high/low tides, and spring/neap tides are accurate, complete, and clearly connected. |
| Use and Interpretation of Data | 20 | Official tide data are correctly recorded, organized, interpreted, and used to support a reasonable prediction or application. |
| Inquiry and Use of Sources | 15 | Information comes from reliable sources, is paraphrased accurately, and is cited properly; sources are evaluated rather than copied. |
| Quality of Final Product | 15 | The advisory is coherent, visually readable, appropriate for the intended audience, and includes all required components. |
| Practical Recommendations | 10 | Recommendations are specific, realistic, and logically based on the scientific explanation and tide data. |
| Collaboration and Role Fulfilment | 10 | Members contribute meaningfully, fulfil roles, support one another, and demonstrate shared understanding during presentation. |
| Reflection and Revision | 5 | The group uses peer feedback to improve the product, and each learner provides a thoughtful individual reflection. |
Conclusion
Tides are not random movements of the sea. They arise primarily from gravitational interactions involving the Moon and the Sun, together with Earth's rotation, and their local expression can be studied through observations and prediction data. By completing this WebQuest, learners connect scientific ideas with real coastal decisions and learn to evaluate, interpret, and communicate information from reliable Internet sources.
Credits
| Resource | Link | Purpose |
| NOAA Ocean Service - Tides and Water Levels Tutorial | https://oceanservice.noaa.gov/education/tutorial_tides/welcome.html | Use for the definition, causes, cycles, and practical importance of tides. |
| NOAA Ocean Service - What Are Tides? | https://oceanservice.noaa.gov/education/tutorial_tides/tides01_intro.ht… | Use for the regular rise and fall of sea level and the meaning of tidal range. |
| NASA Science - Tides | https://science.nasa.gov/moon/tides/ | Use for visual explanations of the Moon's gravitational influence and Earth's movement through tidal bulges. |
| NASA Science - The Moon and Tides Supporting Graphics | https://science.nasa.gov/resource/tides/ | Use for animations and diagrams that may support the group's explanation. |
| NOAA Tides and Currents - Tide Predictions | https://tidesandcurrents.noaa.gov/noaatidepredictions.html | Use for predicted high and low tide times and heights at a selected coastal station. |
Teacher Page
Individual Reflection Questions
1. What was the most important change in your understanding of ocean tides?
2. Which online source was most useful, and why did you consider it reliable?
3. How did the tide data strengthen or challenge your group's initial explanation?
4. How can knowledge of tides protect people or improve decisions in coastal communities?