Nouns denoting natural objects (not man-made)
- fiord
- a long narrow inlet of the sea between steep cliffs; common in Norway
- floor
- the bottom surface of any lake or other body of water
- Muztagh
- a highest mountain peak in the Kunlun Shan in China; near the Indian border (23,891 feet high)
- tidal river
- a stream in which the effects of the tide extend far upstream
- Mekong River
- an Asian river; flows through a large delta in southern Vietnam into the South China Sea
- floor
- the lower inside surface of any hollow structure
- Mount Wilson
- a peak in the San Juan mountains of Colorado (14,246 feet high)
- thermosphere
- the atmospheric layer between the mesosphere and the exosphere
- versant
- the side or slope of a mountain
- Volga River
- a Russian river; the longest river in Europe; flows into the Caspian Sea
- earth
- the 3rd planet from the sun; the planet we live on
- barrier
- anything serving to maintain separation by obstructing vision or access
- boulder
- a large smooth mass of rock detached from its place of origin
- branch
- a stream or river connected to a larger one
- Lake Eyre
- a shallow salt lake in south central Australia about 35 feet below sea level; the largest lake in the country and the lowest point on the continent
- Algol
- the second brightest star in Perseus; the first known eclipsing binary
- Beta Crucis
- the second brightest star in the Southern Cross
- strange particle
- an elementary particle with non-zero strangeness
- mid-water
- the water that is well below the surface but also well above the bottom
- meteorite
- stony or metallic object that is the remains of a meteoroid that has reached the earth's surface
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