Weathering powerpoint. This is best use for observation or demonstration

Weathering powerpoint

1. ROSIE T. DAPURAN, TEACHER APPLICANT

2. Instructions: 1. Listen well. 2. Raise your hand if you want to speak. 3. Participate in class activities

3. Let’s try this first.. “What’s my type?” Identify the rocks that will be presented in the following slides. Click to check your answer.

4. 1. Clue: This rock is formed from melted rocks deep inside the earth. Igneous rock Sedimentary rock Metamorphic rock

5. 2 . Clue: This rock is formed from layers of sand, silt, dead plants and animal skeletons Igneous rock Sedimentary rock Metamorphic rock

6. 1. Clue: This rock is formed from other rocks that are changed by pressure and heat underground Igneous rock Sedimentary rock Metamorphic rock

7. Let’s try this first..

8. “Rock Breaking Challenge” 1. What happened to the rocks when they were hammered? 2. Which among the rocks broke into many pieces?Why? 3. What can you infer in the activity? Follow-up questions:

9. Let’s get started..

10. Weathering Our Topic..

11. At the end of the lesson you are expected to.. Describe how rocks undergo weathering. (S11ES-Iia-22)

12. Take a close look at the following picture. What can you observe about the rocks? Why are those rocks breaking?

13. Activity 1: Agents of Weathering

14. Activity: “Agents of Weathering” Materials: Activity Notebook, pen Instructions: • A guide concept about the agents of weathering will be presented on the screen/ board. • Study the guide concept. • Five (5) pictures will be presented. • In a separate sheet of paper, identify what type or agent of weathering is shown in the picture.

15. Let’s dig deeper...

16. What is weathering? Weathering is the process of breakdown of rocks at the Earth’s surface.

17. Agents of Weathering: 1. Water. Either in liquid or solid form is one of the agents of mechanical weathering. In liquid form, it seeped into cracks and crevices of rocks and when the temperature dropped, it freezes and definitely will expand in the form of ice. The ice then works as a wedge which slowly widens the cracks and splits the rock. When the ice melts, the liquid water performs the act of erosion by carrying away the tiny rock fragments lost in the split.

18. Agents of Weathering: 2. Salt. In the process of haloclasty, salts served as an agent of weathering. Saltwater sometimes gets into the cracks and pores of rock. When it evaporates, salt crystals are left behind and grow in the cracks and pores which caused pressure on the rock and slowly break it apart.

19. Agents of Weathering: 3. Temperature Temperature changes can also contribute to weathering through the process called thermal stress. During thermal stress, rock tend to expand with heat and contract with low temperature. As this happens repeatedly, the structure of the rock weakens and over time crumbles.

20. Agents of Weathering: 4. Plants Plants also served as agents of weathering. Its contribution take place when the seed of a tree being spread in the environment sprout in soil that has collected in a cracked rock. As the roots grow, they widen the cracks, eventually breaking the rock into pieces. Over time, trees can break apart even large rocks. Even small plants, such as mosses, can enlarge tiny cracks as they grow.

21. Agents of Weathering: 5. Animals Animals that tunnel underground, such as moles and prairie dogs, also work to break apart rock and soil. Other animals dig and trample rock aboveground, causing rock to slowly crumble.

22. Activity 2 : “Where do I belong”

23. Activity: “Where do I belong” Materials: Guide sheet, cartolina, marker, tape Instructions: 1. T he class will be grouped into three (3). 2. Each group will be given a guide sheet, activity sheet, marker, cartolina, and tape. 3. The guide sheet contains a concept about the different types of weathering. The activity sheet contains the different statements/ situations wherein weathering occurs. 4. Each group must make a table (the same as below) in the cartolina. 5. The given statements in activity sheet should be classified as to the type of weathering and be rewritten on the column where they belong. 6. Presentation of outputs.

24. Let’s dig deeper...

25. Types of weathering 1. Physical Weathering . Physical weathering is caused by the effects of changing temperatures on rocks, causing the rock to break apart. Following are its types: Abrasion . Freeze-thaw . Exfoliation .

26. Types of weathering 2. Chemical Weathering . Chemical weathering is caused by rainwater reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic. Following are its types: • Carbonation • Hydrolysis • Hydration • Oxidation

27. Types of weathering 3. Biological weathering. O ccurs when rocks are weakened by different biological agents like plants and animals. Following are its types: •Biological Weathering by Physical Means. •Biological Weathering by Chemical Compounds

28. Let’s apply..

29. What risks or disasters in your locality are often related to weathering or breaking of rocks? How do you ensure that this risk will be avoided? When does breaking of rocks/ weathering becomes useful in our daily life? Cite examples.

30. Let’s wrap it up...

31. What are the agents of weathering? What are the types of weathering? How do rocks undergo weathering?

32. Let’s see what you’ve got...

33. Direction: Describe how the following agents make rocks undergo weathering. 1. water 2. salt 3. temperature 4. plants 5. animals Criteria 5 4 3 2 1 Score 1. Correct             2. Complete             3. Comprehensive             Total             Rubric for rating:

34. Assignment.

35. From the concepts you have learned, create a simple 3-minute documentary video or photographic documentation of weathering you will find in your locality/area. The documentation should answer the following questions: Cite what are the risk that you might encounter upon knowing those places are found in your locality? 2. How can you prevent or what precautions will you do to be safe if danger occur ?

36. Have a good day!