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t u b Elements of Nature
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Earth	Earth science · Geology · History of the Earth · Geological history of Earth · Future of the Earth · Structure of the Earth · Plate tectonics
Weather	Earth's atmosphere · Climate
Environment	Ecology · Ecosystem · Wilderness
Life	Hierarchy of life · Origin of life · Life on Earth · Eukaryota (Plants/Flora, Animals/Fauna, Fungi, Protista) · Prokaryote (Archaea, Bacteria) · Virus · Evolutionary history of life · Biology
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