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Comment: 04:14 - 05:19 (01:05)
Source: Annenberg/CPB Resources - Earth Revealed - 21. Groundwater
Keywords: "Earth's surface", sandstone, sediment, soil, water, groundwater, "pore space", porosity, aquifer
Our transcription: Other land surfaces consist of less solid aggregates of materials, such as sandstone, or sediment, or ordinary soil.
Here the water can work its way down through the gaps or intersticies between the individual bits of matter.
Although permeable rock will let the water through, it still may not be a good source of groundwater.
For a rock to contain abundant groundwater it also needs to have a lot of open spaces or pores.
The capacity to transmit water is called "permeability," and the capacity to store water is called "porosity."
The ideal rock material for the accumulation of groundwater is both porous and permeable.
This kind of material is known as an "aquifer", from the Latin for "water bearing."
Sandstone is a good example of an aquifer.
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