Definition: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Input: substance is subjected to the chemical oxygen demand and biochemical oxygen demand tests, and measurements of its quality include TSS and TDS. One property of this substance can be tested for by a circular disk divided into black-and-white quarter-segments and mounted on a pole, a device called a Secchi Disk. Thermal differences in this material can result in different concentrations of carbon dioxide in different layers of it, which can cause a CO2 eruption to occur. Darcy's law can be used to describe the movement of this substance when it is found in rock. For 10 points, name this substance found in aquifers, lakes, and rivers.
Output:
Science