Chemical Weathering Lab

1. Chemical Weathering Lab Objective: Model the rate of chemical weathering using temperature and surface area. Hypothesis: (what is your educated guess about how different temperatures and varied surface area may affect the rate of weathering). Guiding Questions What is surface area? How does it affect the rate of weathering? What is climate? How might that affect the rate of chemical or mechanical weathering?

2. Chemical Weathering Lab In your comp book (Date and Title) Create a data tables for both experiments

3. Groups! Take the data from your two data tables and create two bar graphs. Graph #1 – Surface Area X= Tablet area (Crushed, Broken Whole) Y= Time in Seconds Graph #2 – Temperature X= Temperature (Cold, Warm, Warmer, Hot water) Y= Time in Seconds

4. Analysis and Conclusion Questions:Answer in complete sentences (use red text for help.) Which beaker did the reaction occur most slowly? Most rapidly? What is the relationship between temperature and rate of reaction? What is the relationship between particle size (surface area) and weathering rate? Why might limestone in Barrow, Alaska (a cold climate) weather slowly? What environment do you think weathering would occur the most? The least? WHY?? ….. What type of Rocks do you think would weather the fastest? Give Examples.

5. Erosion Bell ringer Thinking about your chemical weathering lab; what type of climates on Earth have the greatest amount of chemical weathering? Write FIVE quiz questions based on examples of Chemical and Mechanical weathering. You must provide the correct answer.

6. Everyday is a Holiday! National Dance Day!

7. II. Water Erosion “We’re changing Earth’s Surface!”

8. 1. Running Water 2. Energy 3. The water cycle -Most effective agent in wearing down the surface of the earth - From the sun… Powers the running water. - energized by the sun and circulates all of the earths life giving water. A. Stream Erosion

11. 4. Bedrock Breakup -Occurs in 2 ways. a. Mechanical means– Using sand gravels and small rocks the water grinds at the bedrock. Boulders are also used as cutting tools. 1.) This grinding action is called Abrasion.

12. Cutting Tools can be very small and as big as cars.

13. a. Chemical means-dissolving soluble minerals.

14. 5. Transportation -Rivers ability to move material: a. Solution– dissolved materials from bedrock. (25% of stream) b. Suspension– includes clay, silt, and fine sand. Although these materials are heavier than water they are stirred up and kept from settling on the bottom by the water moving. (50% of stream) c. Bed load– Sediment moved along the stream bottom. (25% of stream). Ex large cobbles and boulders.

18. 6. Carrying Power 7. Discharge -Is indicated by amount of sediment and the particle size being moved. a. depends upon the speed of the stream and its discharge. -Is the volume of water flowing past a given point in the stream at a given time. a. Expressed in CFS (Cubic feet per second)

19. 1. Flood Plain - When a river swells and floods and covers part of the valley floor. B. Parts of a Stream

20. 2. Waterfalls - River may flow over hard rock onto a softer one.

22. 3. Meanders -A series of broad curves in the stream bed. 1.) Form when water moves slowly across a wide flood zone. 2.) Also forms oxbow lakes- U shaped cut off of the stream

23. Flow direction

24. Formation of Meanders

25. Point bar deposits

26. Cut bank erosion Point bar deposits } Meander loop

27. Formation of an Oxbow

30. 4. River valleys V-shaped: cutting into floor & walls are worn away. a. Steep valleys create canyons

31. Grand Canyon

32. http://www.youtube.com/watch?v=ktf73HNZZGY

33. 1. Why do streams & rivers deposit sediment? a. Low slope b. Bed widens c. Meets obstruction d. Reaches a lake or sea C. River Deposition

34. Answer: Loss of both discharge and speed This is a photo of a car buried in flood sediments. Question : Why does a river leave so much sediment on its valley floor after a flood?

35. 2. Delta- fan shaped deposit formed at the mouth of a stream

37. 3. Alluvial Fans- sloping deposits where a mountain stream reaches land.

39. If the Mississippi changes course again, what will happen to the City of New Orleans?

40. Erosion Poster Guidelines Erosion Types: • Mechanical vs. Chemical Weathering • Stream Erosion • Wind Erosion • Glacier Erosion Bold Title Catchy subtitle Include five topics about your type of erosion Three diagrams illustrating agent processes Colored Sketch or create digitally

41. Erosion Poster Project Red Textbook- pick one Streams- pg. 272 chem. Glaciers- pg. 291 Wind- pg. 301 Mechanical/Chemical pg. 238 (due April 3rdth A, 4th B day – 40 pts)

42. Stream Carrying Capacity Review Black Text Book Pg. 176- 5,6 Pg. 182- 13, 15 Pg. 185- 16,17,19

43. #9: Erosion Bellringer’s 3. Draw & label a river system with the following features: - waterfall - v shaped valley - meander -oxbow lake - 2 river tributaries - delta

44. Drainage Basin All the land that drains into a river

45. How to Determine a Basin -sketch river & all of its tributaries -circle area where rivers are -all water in that region will drain into the main stream & out its mouth.

46. Mississippi River System

48. Mississippi Basin Drainage Activity Label and color each river Show the direction of each river Show the boundary of the watershed Turn into the basket when complete Show the general direction of each river Create a color coded key for each river

49. Quiz Study Guidelines Difference between WEATHERING & EROSION. Describe exfoliation & sheet jointing. Know examples of both chemical & mechanical weathering. What is abrasion? Know what carrying power & discharge of a stream are. Be able to describe solution, suspension, & bed load & what makes up each part.