Meaning: This sentence describes the common occurrence of rain falling on the ground. It emphasizes the importance of rain for plants and the environment.
Choice of Words: Rain is water falling from the sky in drops. "Fall" means to move downward under the force of gravity. "Heavy" describes the amount of rain, and "thirsty" describes the dryness of the ground. Combining these elements, "Rain falls heavy on thirsty ground" paints a picture of a much-needed downpour quenching the dryness of the earth.