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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 
cement
Natural environment; Coral reefs
The chemically precipitated calcium carbonate present in spaces within skeletons or between grains of internal sediment.
weathering
Natural environment; Coral reefs
The mechanical or chemical decomposition of rocks due to weather .
aquiferous system
Natural environment; Coral reefs
Water circulatory system in sponges composed of choanoderm, pores and chambers.
extrinsic factor
Natural environment; Coral reefs
A biotic or abiotic factor acting on an organism or population from outside the organism or population.These are the physical and chemical features of the environment, as well as ...
autoimmune disease
Natural environment; Coral reefs
A disease in which the organism produces antibodies against its own tissues.
colonial
Natural environment; Coral reefs
A level of cellular organization intermediate between unicellular and multicellular; refers to organisms that occur in a fixed location, with one generation growing on top ...
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)