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Water cycle

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The continuous process by which water moves from earth's surface to the atmosphere and back

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Infiltration

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Flow of water from the land surface into the subsurface

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Run-off

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Water that flows over the ground surface rather than soaking into the ground

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Aquifer

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An underground formation that contains groundwater

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River Basin

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The entire geographical area drained by a river and its tributaries

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Eutrophication

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A process by which nutrients, particularly phosphorus and nitrogen, become highly concentrated in a body of water, leading to increased growth of organisms such as algae or cyanobacteria

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Recharge

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Process by which water from precipitation and runoff is added to underground reservoirs of water

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Capillary action

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The movement of water within the spaces of a porous material due to the forces of adhesion, cohesion, and surface tension

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Cohesion

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Measure of how well molecules stick to each other, particularly water molecules

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Adhesion

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Tendency of dissimilar particles or surfaces to cling to one another