12N TAMMS Earthworks & Surveying Practice Exam 2026 – Your All-in-One Guide to Success!

The correct choice is that too much water between soil particles creates instability in the soil. When soil becomes overly saturated with water, the effective stress between the particles is reduced, which can lead to a condition known as soil liquefaction or reduce the soil's shear strength. This instability increases the risk of landslides or settlement, especially under load, which can compromise structures built on or within the soil.

While the idea of an incompressible cushion might sound plausible, excess water does not behave as a cushion in practical terms; instead, it disrupts the inter-particle forces that are necessary for maintaining soil structure. Additionally, excess water typically does not enhance soil nutrients; rather, it can lead to nutrient leaching and poor soil health. Lastly, too much water generally hinders drainage rather than promoting it, as saturated soil can slow or prevent the flow of water through the soil matrix.