Impermeable rock is the layer underground where all empty spaces are filled with a combination of air and water. Thus, the correct option is A.
A rock is defined as a solid collection of mineral grains which grow or become cemented together. Some rocks are large whereas others are small rocks are known pebbles.
An impermeable rock is a layer of solid material which does not allow water to pass through it. Impermeable rocks comprises shales and nonfractured igneous and metamorphic rocks.
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