In the "soil and sand" bottle, which type of soil is on the bottom?

Sand will remain at the bottom as its made up of rocks.

Explanation:

As sand is apart of the soil and soil is made up f liquids gases and solids and sand are natural that comprises of the 85% of the particles.  And soil has decomposed parts of plants and animals and has clay, mud and thus is darker in color and sand is light in color.

Maybe a horizontal because its a pattern

Answer (d) may increase or decrease porosity through dissolution or deposition;