Sediments
from the San Pedro river + 1g CaSO4
We mixed
sediments with some water (looking like a milkshake) and added one
gram of calcium sulfate using a funnel to fill 1/4 of the content.
Then we added sediments from The San Pedro river to fill almost the
whole. Finally we added some water. At time zero, the bottle has a
uniform color (dark brown) and the same in all content. Then we
placed on a lit place in order to create an ecosystem with a gradient
of O2 which decreases down and one of sulfate which decreases
upwards.
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