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How long does it take light to cross the Milky Way galaxy?
Water Table
The upper surface of the zone of saturation in the ground, below which the soil, gravel, or rock is saturated with water.
Subsurface Material
Materials found beneath the Earth's surface, which can include soil, rock, liquids, and gases.
Groundwater Divide
A relatively high area of the water table, separating groundwater that flows in opposite directions.
Subsurface Material
Refers to the layer of soil, rock, and other materials that lie beneath the surface of the Earth.
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