The statement, that describes the top layer of groundwater is "water table."
Groundwater is water that exists underground in cracks and crevices in soil, sand, and rock. Water below in saturated zones under the land surface is referred to as ground water. Ground water, on the other hand, does not form underground "rivers." It plugs holes and fissures in subterranean materials including sand, gravel, and rock.
The water table is the upper surface of this water-filled area, or "zone of saturation." An aquifer is the saturated land beneath the water table, and aquifers are massive reservoirs of water.
To put in another way, the water table is found at the top of the saturated zone. The water table could be just below the soil surface or hundreds of feet below.
Hence the correct option is 1.
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