What is meant by surface runoff?

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Surface runoff refers to the movement of water over the Earth's land surface, typically following rainfall or melting snow. This process occurs when the rate of precipitation exceeds the soil's absorption capacity, leading to excess water that flows into streams, rivers, lakes, and ultimately oceans.

This phenomenon is crucial in hydrology because it plays a significant role in the water cycle, influencing water availability in ecosystems, dictating flood risks, and affecting water quality as it can carry pollutants from land areas into water bodies.

The other options describe different hydrological processes. Absorption of water by the soil pertains to infiltration, while the movement of water through aquifers refers to groundwater flow. Water retained in glaciers and ice caps describes cryospheric water storage, which is not related to the immediate movement of water across the land surface.