What is the difference between the saturated and unsaturated zones of groundwater?

A. The pore spaces in the saturated zone are completely full of water; the pore spaces in the unsaturated zone are not completely full of water.
B. The saturated zone has a lower porosity than the unsaturated zone.
C. The saturated zone has a higher porosity than the unsaturated zone.
D. The pore spaces in the saturated zone are not completely full of water; the pore spaces in the unsaturated zone are completely full of water.

The difference between the saturated and unsaturated zones of groundwater lies in the amount of water filling the pore spaces. In the saturated zone, the pore spaces are completely full of water, whereas in the unsaturated zone, the pore spaces are not completely full of water.

To explain this further, imagine a sponge. When a sponge is completely soaked in water, it represents the saturated zone, where all the pore spaces are filled with water. On the other hand, when a sponge is only partially filled with water, it represents the unsaturated zone, where the pore spaces are not completely filled.

In conclusion, the key difference between the saturated and unsaturated zones of groundwater is the level of water filling the pore spaces. The saturated zone is completely filled with water, while the unsaturated zone is only partially filled.

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