Winogradsky Column. Two weeks later (Group B2)

A week after we prepared our column no major changes had occured so we will talk about the ones that happened over the next week.
The Winogradsky column has grown as  expected. We can notice that the amount of mud has decreased while the FeS amount, which is black colored, has increased. There's still some mud to be used as substrate on the top. However,  we can observe a methane chamber made by the enormous amount of organic material added. As this chamber can be dangerous we shake the column in order to remove it.

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Also we could appreciate a very hideous smell caused by the sulfhydric acid. We needed to pierce the column too so it wouldn't explode.
Finally, we expect the black zone to increase in size consuming more organic material.

Inés, Daniel y Andrea