Task: Text Categorization
Input (English): 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 (English): Science