Which of the following information can be obtained from test holes?

Test holes, also known as boreholes, are crucial tools used in hydrogeological studies and groundwater assessments. When people drill test holes, they gather valuable geological data from various depths in the subsurface. The primary purpose of these test holes is to investigate the formation strata, which include the layers of soil, sediment, and rock beneath the Earth’s surface.

In addition to identifying the formation strata, test holes also allow for the measurement of thickness, which is essential for understanding the vertical extent of different geological materials. This contributes to a better grasp of the groundwater flow and storage potential in an area. Moreover, porosity, which indicates the void spaces in a material that can hold water, can also be assessed. Knowing the porosity of these geological formations helps in estimating how much groundwater can be stored and transmitted, influencing water resource management decisions.

In contrast, the other options pertain to different aspects not directly related to what test holes can provide. Rainfall data, wildlife populations, and vegetation types are typically gathered through observational studies, surveys, or remote sensing rather than through geotechnical investigations like test hole drilling.