Question

Arrange the following in decreasing order of Porosity :
1. Aquifer
2. Aquitard
3. Aquiclude
4. Aquifuge

• A. 1, 2, 3, 4
• B. 3, 4, 2, 1
• C. 4, 3, 2, 1
• D. 3, 2, 1, 4

Answer 1

The correct option is D 3, 2, 1, 4

Aquifer = Geological formations which are both porous and permeable.
E.g. Fine sand, Coarse silt

Aquiclude = Geological formations which are highly porous but impermeable.
E.g. Clay

Aquitard = Geological formations which are porous but less permeable.
E.g. Sandy clay.

Aquifuge = Geological formations which are neither porous nor permeable.
E.g. Granite rock