The students took samples of water from different places in the "Albufera" and analysed them there. They took notes and then reported their results to a marine biologist. To our surprise, using very simple tools, we got almost the same results as the University of Barcelona.
The students also observed the landscape to guess how the "Albufera" was formed. They made a hypothesis in groups.
They also took some samples of stones which they analysed in the lab in the next session.