Nouns denoting natural objects (not man-made)
- storm cloud
- a heavy dark cloud presaging rain or a storm
- strand
- a poetic term for a shore (as the area periodically covered and uncovered by the tides)
- Atacama Trench
- a depression in the floor of the Pacific Ocean off the coast of Chile
- declivity
- a downward slope or bend
- maar
- a flat-bottomed volcanic crater that was formed by an explosion; often filled with water
- Osaka Bay
- a bay of the western Pacific in southern Honshu
- river
- a large natural stream of water (larger than a creek)
- billabong
- a branch of a river made by water flowing from the main stream only when the water level is high
- Corona Borealis
- a small constellation in the northern hemisphere between Bootes and Hercules
- thermion
- an electrically charged particle (electron or ion) emitted by a substance at a high temperature
- geyser
- a spring that discharges hot water and steam
- South China Sea
- a tropical arm of the Pacific Ocean near southeastern Asia subject to frequent typhoons
- Triangulum
- a small northern constellation near Perseus between Andromeda and Aries
- North Platte River
- a river that rises in northern Colorado and flows northward into Wyoming and then eastward and southeastward through Nebraska where it joins the South Platte to form the Platte River
- interplanetary medium
- interplanetary space including forms of energy and gas and dust
- Gulf of Aden
- arm of the Indian Ocean at the entrance to the Red Sea
- drift ice
- masses of ice floating in the open sea
- stalactite
- a cylinder of calcium carbonate hanging from the roof of a limestone cave
- Lake Geneva
- a lake between southwestern Switzerland and France that is crossed from east to west by the Rhone
- placer
- an alluvial deposit that contains particles of some valuable mineral
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