Which term describes a material that has many small openings allowing liquid to pass through?

The term that best describes a material with many small openings allowing liquid to pass through is "porous." A porous material is characterized by its ability to hold and transmit fluids due to the presence of tiny holes or voids within its structure. This property is essential in various applications such as soil permeability, filtration systems, and groundwater movement, as it enables the passage of liquids through the material effectively.

In contrast, the term "pervious" is closely related to porous materials but generally refers to the ability of a material to allow water to flow through it freely. While both terms describe materials that permit liquid movement, "porous" specifically highlights the presence of openings, making it the most accurate term in this context.

On the other hand, "impermeable" describes materials that do not allow fluids to pass through, while "dense" refers to the mass of a material relative to its volume and does not inherently imply anything about fluid permeability. Thus, "porous" is the most precise choice to denote the presence of many small openings facilitating liquid passage.