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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Coral reefs 
parts per million (ppm)
Natural environment; Coral reefs
Number of parts of a substance found in one million parts of a particular gas, liquid, or solid.
perisarc
Natural environment; Coral reefs
The chitinous outer coat of common tissue connecting individuals in some colonial hydrozoans.
abrasion
Natural environment; Coral reefs
The mechanical process of gradually breaking down a hard layer.
epidemic spawning
Natural environment; Coral reefs
The simultaneous shedding of gametes by a large number of individuals.
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
- Climate change (10457)
- Coral reefs (23903)
- Deserts (738)
- Earthquake (7143)
- Flood (34)
- Forests (37)
- Grassland (35)
- Land mass (144)
- Landslide (66)
- Mountains (203)
- Plateau (39)
- Speleology (1857)
- Volcano (5852)
- Water (18527)