The following content appears in the Topics section of Portal:World
Continents of Earth | ||||||||
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| Cenozoic Era (present–66.0 Ma) |
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| Mesozoic Era (66.0–252 Ma) |
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| Paleozoic Era (252–539 Ma) |
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| Proterozoic Eon (539 Ma–2.5 Ga) |
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| Archean Eon (2.5–4 Ga) | |||||||||||||
| Hadean Eon (4–4.6 Ga) | |||||||||||||
ka = kiloannum (thousand years ago); Ma = megaannum (million years ago); Ga = gigaannum (billion years ago). See also: Geologic time scale •  Geology portal •  World portal | |||||||||||||
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| Related | ||
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Economic classification of countries | |||||
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| Three-World Model | |||||
| Gross domestic product (GDP) |
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| Gross national income (GNI) | |||||
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| Wealth | |||||
| Other national accounts | |||||
| Human development | |||||
| Digital divide | |||||
| Net international investment position (NIIP) | |||||
| Technological |
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| Sociological | |||||
| Ecological |
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| Biological |
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| Astronomical | |||||
| Eschatological |
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| Others |
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| Fictional | |||||
| Organizations | |||||