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
Data Table #1 – Surface Area
(same temperature each time)
Tablet Area
Time (Seconds)
Crushed
Broken (1/4ths)
Broken 2 (1/2) table
Whole tablet
Data Table #2 – Temperature (Celsius)
(use whole tablet each time)
Water Temperature
(degrees Celsius)
Time (Seconds)
COLD (take temp)
WARM (take temp)
WARMER (take temp)
HOT (take temp)

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)

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

8. A. Stream Erosion 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.

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. -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.
5. Transportation

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

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

31. Grand Canyon

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

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

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 ,6 Pg , 15 Pg ,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.