Nouns denoting natural objects (not man-made)

Sagittarius
a large zodiacal constellation in the southern hemisphere; between Scorpius and Capricornus
 
salt marsh
low-lying wet land that is frequently flooded with saltwater
 
ozone hole
an area of the ozone layer (near the poles) that is seasonally depleted of ozone
 
antiproton
an unstable negatively charged proton; the antiparticle of a proton
 
Fox River
a river in Wisconsin that flows into Lake Michigan
 
Kura River
a river in western Asia; rises in northeast Turkey and flows to the Caspian Sea
 
hadron
any elementary particle that interacts strongly with other particles
 
James River
a river in Virginia that flows east into Chesapeake Bay at Hampton Roads
 
Trinity River
a river in eastern Texas that is formed near Dallas and flows generally southeastward to Galveston Bay
 
Yellow River
a major river of Asia in northern China; flows generally eastward into the Yellow Sea; carries large quantities of yellow silt to its delta
 
Hydrus
a constellation in the southern hemisphere near the south celestial pole
 
Coeur d'Alene Lake
a lake in northern Idaho
 
shift
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
 
shoreline
a boundary line between land and water
 
Cancer
a small zodiacal constellation in the northern hemisphere; between Leo and Gemini
 
San Diego Bay
a bay of the Pacific in southern California
 
tau-plus particle
an antilepton of very great mass
 
Gulf of Bothnia
a northern arm of the Baltic Sea; between Sweden and Finland
 
Colorado Plateau
a large plateau to the south and west of the Rocky Mountains; abuts mountains on the north and east and ends in an escarpment overlooking lowlands to the south and west; the Grand Canyon is carved out of the southwestern corner
 
Niagara Falls
waterfall in Canada is the Horseshoe Falls; in the United States it is the American Falls
 
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