WEATHERING OF ROCKS
- 1. WEATHERING Copy Lesson Objectives To find out what is meant by weathering. To investigate how factors such as heating and cooling, wind and acid rain can break down rock to form small particles
- 2. Starter Activity THINK : Imagine the tiniest rock you have ever found. How did it get so small? It didn’t start out that way! What forces created this rock?
- 3. Imagine the gravestones. How did they get so small? What are the forces acting on them?
- 4. What is Weathering? Weathering- is the process by which natural forces break down rocks Did You Know? Weathering breaks rocks into smaller pieces.
- 5. If you live in a city, you might notice worn stone buildings, streaks on your car roof or corroded metal railings and statues.
- 6. ACID RAIN Acid rain occurs when gases (e.g sulphur dioxide and nitrogen oxides) are emitted into the atmosphere, undergo chemical transformations and are absorbed by water droplets in clouds which then falls back as rain.
- 7. Formation of Acid Rain Explain why acid rain occurs mostly in the cities. OR Explain why you are less likely to have acid rain in a village near Stevenage than in London city?
- 8. PRACTICAL ACTIVITY PREDICTION: Make your prediction before you start. RESULTS Draw the table below and enter your results CONCLUSION What is your conclusion? Temperature (degree cels.) Time to form crystals (mins/sec) Size of crystals (large, medium. small) Freezing Room 60 C