Aquifer

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Permeable earth material that contains and carries groundwater.

Atesian Formation

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The arrangement of a permeable layer of rock, sandwiched between two layers of empermeable rock.

Evapotranspiration

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Addition of water vapour to the atmosphere by evaporation from Earth's surface of from plant leaves.

Geysers

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A boiling hot spring that erupts periodically.

Hydrosphere

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All the waters of earth, including both surface and subsurface water.

Impermeable

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Describes a rock material through which water does not pass easily.

Permeability

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A measure of a rock's ability to transmit water or other liquids.

Porosity

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Percentage of a material's volume that is pore space.

Water Budget:Usage, Deficit, Recharge, Surplus

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Describes the income and spending of water in a region.

Usage: the condition where plants draw water from the soil at times when the need for moisture is greater than the rainfall.

Deficit: A condition in which stored soil water is gone and the need for moisture is greater thatn the rainfall.

Recharge: The refilling of soil water supply at times when plants need lettle stars.

Surplus: Condition of having rainfall greater than the need for moisture when the soil is already saturated.

Water Table

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The surface below which the fround is saturated with water.

Water Cycle

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The hydrologic cycle, the never-ending movement of water from one part of the hydrosphere to another.