Yes, it is, meaning underneath the surface. Underground can also be a noun.
Underground is an adverb, as in beneath the surface of the ground. It is an adjective, as in an underground car park
it is an adjective because it is describing something.ex. the tunnel is underground-it describes where the tunnel is :)
The correct spelling of the adjective is subterranean(underground).
An underground cavern is a large cave or chamber typically found beneath the Earth's surface. These formations are often created through geological processes such as erosion, dissolution of rock, or volcanic activity. Underground caverns can contain unique ecosystems and geological features.
Cavern. ++++ More often, just Cave - and the adjective "underground" is superfluous by noun's definition.
It's actually spelled "souterrain" and it means "underground" (adjective).
No, Magmatic is and adjective meaning of or realting to magma. Magma is not a mineral but molten rock underground.
It is usually seen as two words, but technically should be hyphenated as the adjective above-ground because ground is not an adjective by itself.
Its two words, Under and Ground. Under being the adjective describing the location and ground being a noun for teh subject.
100% of underground is underground.
large snakes +++ possibly, in tropical areas, but not as a rule apart from a species in caves in Borneo that preys on bats using caves as roost. The main living things underground are a range of invertebrates, a few species of fish and salamander, bats and cave-swifts (but both feed outside), and various micro-organisms. And caverns are underground - you don't need the adjective!
The Latin word for 'rabbit' is cuniculus. The Latin noun also may be translated as 'an underground passage, a mine'. A derivative is the adjective 'cuniculosus', which means 'full of rabbits, full of caverns'.