The phreatic zone, also known as the saturated zone, is the area beneath the Earth's surface where all the pore spaces in soil and rock are filled with water. In this zone, water moves through the soil and rocks and is influenced by gravity and pressure. The top boundary of the phreatic zone is called the water table, which separates it from the vadose zone (the unsaturated zone above the water table where the soil pores contain both air and water).
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