March 28, 2011
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March 28, 2011 1. Finish Our Profiles – Turn In at End • Finished? Special nautical chart assignment 2. Ocean Floor Lab Part II • I’ll be checking science notebooks while you do lab 3. Homework: Short reading + 3 questions, due next class
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Finish Our Profiles – Turn In at End Finished? Special nautical chart assignment Ocean Floor Lab Part II I’ll be checking science notebooks while you do lab Homework: Short reading + 3 questions, due next class. March 28, 2011. Profiles. Very good in general; we’re almost done - PowerPoint PPT Presentation
Transcript of March 28, 2011
March 28, 20111. Finish Our Profiles – Turn In at End
• Finished? Special nautical chart assignment2. Ocean Floor Lab Part II
• I’ll be checking science notebooks while you do lab
3. Homework: Short reading + 3 questions, due next class
Very good in general; we’re almost done There were some things I didn’t explain well:
In general, use same scale on both axes if you want your profile to look “real” – okay this time
I should have added a “cumulative” column to your data sheets to make graphing easier
Make sure to use the same units Remember that your graph is a “profile” or “cross
section” of the path you walked
Profiles
“Cumulative” Column
Measurement Rise Cumulative Rise Run Cumulative Run
1 5.1 5.1 8.7 8.7
2 5.25 5.1 +5.25 = 10.35 10.1 8.7 + 10.1 = 18.8
3 5.1 10.35+5.1 = 15.45 20.5 18.8 + 20.5 = 39.3
Insert columns
Then you can read off the (x,y) pairs to graph:(0,0) (8.7, 5.1) (18.8, 10.35) (39.3, 15.45) etc.
Questions to Answer1. What was the average slope of your profile?2. How does your average slope (answer to #1) compare with
the average slopes of seafloor features shown below?
0.115°
5-25°
0.34°
10-15°5°
30-45°
0°
Do Not Open the Box
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Use a Fine Felt Pen to Mark 15 cm of Skewer (“Depth Sounder”)
Choose Approximately 10 Transects (Lines) to Investigate
10 Lines
Carefully Punch Holes in the Middle of MOST (not all) of the Squares Along Each Line (Transect)
Measure the “Water Depth” and Record the Depth Next to the Hole
15 cm is the top of my skewer
Therefore water depth = 15 – 4.5 = 10.5 cm
4.5 cm leftover
Fold a Sheet of Graph Paper and LABEL it With the Line Name
Record the depth as a Point
10.5 cm
Measure More Depths and Record
Connect the Points
10.5 cm
Ocean Surface
Ocean Floor
Cut Out the Seafloor Shape
Repeat for all Transects (Lines)
• Punch Holes• Sound Depth• Record Depth on Box Lid (ocean surface)• Fold Graph Paper and Label Which Line it is• Mark the Depths on the Graph Paper• Connect the Points• Cut Out Seafloor Shape
Tape or Glue All Transects to Lid
Open the Box
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