Nouns denoting natural objects (not man-made)

mouse nest
where mice bear and raise their young
 
moon
any natural satellite of a planet
 
abyss
a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)
 
wadi
gully or streambed in northern Africa and the Middle East that remains dry except during rainy season
 
landfall
the seacoast first sighted on a voyage (or flight over water)
 
Hangzhou Bay
a bay formed by an inlet of the East China Sea
 
wall
anything that suggests a wall in structure or function or effect
 
Niagara River
a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York
 
ozone hole
an area of the ozone layer (near the poles) that is seasonally depleted of ozone
 
graviton
a gauge boson that mediates the (extremely weak) gravitational interactions between particles
 
Mekong River
an Asian river; flows through a large delta in southern Vietnam into the South China Sea
 
couple
(physics) something joined by two equal and opposite forces that act along parallel lines
 
gauge boson
a particle that mediates the interaction of two elementary particles
 
Galilean satellite
one of the four satellites of Jupiter that were discovered by Galileo
 
concretion
a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
 
Sierra Madre Oriental
a mountain range in northeastern Mexico the runs parallel to the coastline of the Gulf of Mexico
 
water hole
a natural hole or hollow containing water
 
Purus River
a Brazilian river; tributary of the Amazon River
 
Lake Nasser
lake in Egypt formed by dams built on the Nile River at Aswan
 
Uranus
a giant planet with a ring of ice particles; the 7th planet from the sun has a blue-green color and many satellites
 
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