Rio San Pedro sediment + 1g CaSO4
Our column has not changed very much these weeks. We visited it a few days ago and see that nothing changed but the little dark stains (which are the reduced iron) that are bigger now and there are more of them. Last week we took some photos to see the changes:
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| Our column after a few weeks. |
We can see that our column is darker than ever, and there are more little orange sediments on the top of the bottle.
Our column has not changed very much but in the colum of the group 10B (the light bottle one) that day we spot some little intruders. There were as we can see in the photo below some snails looking around in the top of the bottle.
We suppose that this is due to the fact that the sediment was taken from the San Pedro's river and the snails were inside of it. We could saidly afirm that maybe there was snails inside our column too, but the lack of organic matter and light did not make the life easy in there for them. Now they may rest in peace.
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| A comparation of the columns. |
Now, if we compare our column with the group 10B (light column) one, we can see that their column does not present big black stains. Also, their column have a green colour in contrast to our. This is because of the presence of photosynthetics microorganisms, that need chlorophyll to capture light photons
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ReplyDeleteThe obituary to the unknown fallen snails of the world made me sad...
ReplyDelete