Groundwater is an important source of water. The top level of the groundwater layer is called:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. water table.
The water table is the top level of the groundwater layer, representing the boundary between the saturated zone (where all pores in the soil or rock are filled with water) and the unsaturated zone (where pores contain both air and water). It rises or falls depending on rainfall, extraction of groundwater, and seasonal variations.
Other options:
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Underground water: A general term for all water beneath the earth’s surface; not specific to the top level.
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Well: A man-made structure to access groundwater, not a level itself.
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Sea level: Reference level for measuring elevation; not related to groundwater depth.