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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