Anything like hotel, car parking, train track which have been built under the normal level of the ground is known as underground one. May be a tunnel under the earth. Shape may by like U, so is named in German as U-bahn.
u-bahn
u-bahn
Americans would likely refer to the Underground as the subway or the metro, depending on the region.
In Germany it's called "U-Bahn".
Bus systems.
Echidnas do dig burrows underground, but they do not necessarily live there. These burrows are usually for the purpose of incubating their young. Echidnas refer to live among rocks or under thick bushes.
Aquifers refer to bodies of water stored in underground places like rock formations or soils. These underground reservoirs hold groundwater that can be accessed through wells for various uses such as drinking water or irrigation.
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The word "underground" can refer to things hidden or secret, such as underground movements or music scenes. It can also mean below the surface, as in underground tunnels or subway systems. Additionally, it is often associated with counterculture or alternative movements.
no. the underground railroad was a secret (underground) chain of people who would help slaves reach freedom. the "railroad" part of the underground railroad was simply a way to refer to the chain of people that runaway slaves would stay with.
Geologists refer to underground water as groundwater. Groundwater is water that is found beneath the Earth's surface in soil pores and rock formations, and it is a vital natural resource for drinking water and irrigation.
The "underground railroad" is a term used, in a broad sense, to refer to secret routes and safehouses to assist escaped slaves. There was no single "underground railroad". While there were notable people involved in this, there was no "founder" of it because the term is too broad.