How does radon typically move through rock and soil?

Radon typically moves through rock and soil easily due to its gaseous nature. Radon is a noble gas that is formed naturally as uranium and thorium in soil and rock decay. Since it is a gas, it can migrate through the pores and cracks in the soil and rock layers without significant obstruction. This movement is facilitated by the natural flow of air and can occur even in relatively tight soils.

The high mobility of radon is crucial to understand when assessing radon levels in homes and buildings, as it can accumulate in enclosed spaces, posing health risks through inhalation. Therefore, recognizing that radon escapes from its source and can move through various geological formations helps in understanding how to manage and mitigate radon exposure effectively.

The other options suggest a misunderstanding of radon's properties and behavior; for instance, the notion that radon moves with great difficulty or only in liquid form does not align with its characteristics as a gas. Additionally, stating that radon does not move at all contradicts the fact that it can readily diffuse through the ground and into the atmosphere.