What can be excluded from the list of underground materials that holds water in the ogallala aquifer

Answer 1

The Ogallala Aquifer, also known as the High Plains Aquifer, is primarily composed of sedimentary materials that include:

1. Sandstones - Porous and can hold water.
2. Siltstones - Fine-grained and can retain moisture.
3. Gravel - Highly permeable and holds significant amounts of water.
4. Clay - Though generally less permeable, certain types can hold substantial water in small amounts.

From this context, materials that can be excluded from the list of underground materials that hold water would include:

1. Igneous Rocks - Such as granite, which generally do not have the porous characteristics needed to store water in significant quantities.
2. Metamorphic Rocks - Such as schist or gneiss, which also do not typically have the same water-holding properties.
3. Non-permeable substrates - Such as solid bedrock or areas composed of dense materials that do not allow water movement or retention.

In summary, any materials that are not sedimentary and do not have significant porosity and permeability can be excluded from the list of underground materials that hold water in the Ogallala Aquifer.