Nouns denoting natural objects (not man-made)

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
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
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
a constellation in the southern hemisphere near the south celestial pole
Coeur d'Alene Lake
a lake in northern Idaho
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
a boundary line between land and water
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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