the zone of aeration
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The water table acts as the boundary between the aeration zone and saturation zone. Below the water table, the pores are fully saturated with water, while above the water table, there is both air and water in the soil pores.
This condition is known as saturated zone or water-saturated zone. It occurs in areas where all pores in the rock are filled with water, creating a water-saturated environment. Groundwater is typically found in the saturated zone.
The surface zone is the top layer of a body of water where there is the most interaction with the atmosphere. It is where light penetrates and where temperature changes are most noticeable. This zone is important for supporting aquatic life and plays a crucial role in the overall health of aquatic ecosystems.
The top surface of groundwater is called the water table. It represents the boundary between the unsaturated zone above, where soil pores contain both air and water, and the saturated zone below, where all pores are filled with water. The water table fluctuates with factors such as precipitation and human activities.
The top layer of the ocean, known as the epipelagic zone, typically extends to a depth of around 200 meters. This zone is well-lit and is where most marine life resides due to the availability of sunlight for photosynthesis. Beyond this depth is the mesopelagic zone, which extends from 200 to 1000 meters deep.