Answer: it's a because the answer c makes no sense and theirs no way for it to form from a volcano
Dry and humid as that is the climate of texas
Generally the order is for materials of a single molecule
Gasses are the least dense
Liquids are in between
Solids are the most dense
as evident if you pour sand in a cup of water, the least dense air (gas) will float on top, and the most dense sand (solid) will sink to the bottom.
However, there are some exceptions,
example, water
ice happens to less dense than water but it is a solid, the molecules of water happen to structure themselves in a way that makes them take up more space than water molecules following around each other
