What does the water table represent?

The water table represents the upper boundary of the saturation zone, which is the area underground where all the voids and pores in the soil or rock are filled with water. Above the water table, the soil and rock are not fully saturated and may contain both air and water, while below the water table, the pore spaces are completely filled with groundwater.

This concept is crucial for understanding aquifers, groundwater movement, and the availability of water resources. The depth of the water table can vary significantly based on factors such as precipitation, temperature, and human activities like irrigation or groundwater extraction. Therefore, B provides a clear definition and context for the water table as it delineates the area that is water-saturated.

The other choices represent different concepts. The level of water pollution refers to contamination in water bodies but does not relate to the physical boundary defined by the water table. The depth of groundwater is a related idea but does not accurately define the water table itself, which is not about depth, but rather a specific boundary. The height of oceans completely diverges from the topic, as oceans pertain to surface water rather than groundwater and the water table.