Wednesday, March 4, 2009

Osakis Earth Science Investigations

Lake Core Investigation, Osakis High School

Names: Paul, Rachelle, Becka, John

Procedure: 1. Drop two drops of water on glass slide.
2. Smear the sample onto the slide with tooth picks.
3. Put the cover slip on.
4. Examine the samples under a microscope.

Materials: 1. Glass slides
2. Cover slips
3. Compound microscope
4. Pencils.
5. Science journal
6. Tooth picks
7. Water dropper
8. Core sample (at 1cm and 33cm).
Data/Result: Total Diatoms-166
Navicula-2
Melosira-139
Nitzchia-2
Amphora-6
Surirella-4
Syndra-9
Unknown-1
Fragilaria-1
Gomphomema-1
Frustulia-1

Conclusion: We found that there are more diatoms at 33 cm that at 1 cm.  Three out of four of our people had more diatoms in 33 cm than in 1 cm.  We think that there are more diatoms at 33 cm because it had more time to develop. 

Questions/Comments/Concerns:
Do only certain diatoms live during a certain time or doesn't it matter when or where they lived.

No comments:

Post a Comment

Please give us feedback on our work!