Residue from burning pulverized coal.

Fine, abrasive particles from eruptions.

Alkaline chemical compound, sodium carbonate.

Christian day of repentance, fasting.

Residue remaining after complete combustion.

Tree, often mistaken for ash.

Residue from burned organic material.

Deciduous tree with compound leaves.

Container for collecting cigarette ashes.

Residue from burned wood combustion.

Residual byproduct from burning coal.

Deciduous trees, often with samaras.

Residue from burning organic material.

part of the non-combustible residue of combustion in a power plant, boiler, furnace, or incinerator.

Calcined bones used in ceramics.

Deciduous tree, Fraxinus pennsylvanica, foliage.

Spiny tree, numbing medicinal bark.