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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
the real physical matter of which a person or thing consists

material, stuff go
the tangible substance that goes into the makeup of a physical object

rock, stone go
material consisting of the aggregate of minerals like those making up the Earth's crust

igneous rock go
rock formed by the solidification of molten magma

volcanic rock
extrusive igneous rock solidified near or on the surface of the Earth

noun.substance

7 Subcategories

agglomerate go
volcanic rock consisting of large fragments fused together
amygdaloid go
volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
dacite go
a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
basalt go
the commonest type of solidified lava
volcanic glass go
a kind of natural glass produced when molten lava cools very rapidly
lava go
rock that in its molten form (as magma) issues from volcanos
tuff, tufa go
hard volcanic rock composed of compacted volcanic ash