Nouns denoting natural objects (not man-made)

corner
a projecting part where two sides or edges meet
 
wormhole
hole made by a burrowing worm
 
Great Mendenhall Glacier
a glacier of the Piedmont type near Juneau in Alaska
 
Snake River
a tributary of the Columbia River that rises in Wyoming and flows westward; discovered in 1805 by the Lewis and Clark Expedition
 
gene delivery vector
a vector for delivering genes into cells
 
dipole molecule
a molecule that is a permanent dipole
 
Araguaia River
a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River
 
Argun River
a river in eastern Asia that arises in China and flows northeast along the border between China and Russia to become a tributary of the Amur River
 
eggshell
the exterior covering of a bird's egg
 
sand bar
a bar of sand
 
Mount Sinai
a mountain peak in the southern Sinai Peninsula (7,500 feet high); it is believed to be the peak on which Moses received the Ten Commandments
 
nebula
an immense cloud of gas (mainly hydrogen) and dust in interstellar space
 
North Sea
an arm of the North Atlantic between the British Isles and Scandinavia; oil was discovered under the North Sea in 1970
 
East China Sea
part of the Pacific Ocean near eastern Asia
 
Arkansas River
a river that rises in the Rocky Mountains in Colorado and flows southeast through Kansas and Oklahoma and through Arkansas to become a tributary of the Mississippi River
 
mud puddle
a puddle of mud
 
Gulf of Riga
an inlet of the Baltic Sea between Latvia and Estonia
 
Orinoco River
a South American river 1,500 miles long; flows into the South Atlantic
 
footwall
the lower wall of an inclined fault
 
hydrogen ion
a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
 
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