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Interne struktuur en plaattektonika
Aangesien die omwentelingsas van die Aarde nie loodreg op sy wentelbaan staan nie, maar 23,4° daarvan afwyk (die inklinasiehoek), verander die hoek waarmee die Son se strale die Aarde tref in die loop van 'n jaar. Hierdie verandering dra ook, saam met die Aarde se beweging om die Son, by tot die planeet se seisoene. Die noordelike halfrond is tydens sy somer verder weg van die son as in die winter, wat beteken dat die somer 'n paar dae langer as die winter duur. Vir die suidelike halfrond geld die teenoorgestelde.
Rampe en gevare
Die naam "Aarde" is afkomstig van die Oud-Nederlandse woord "Ertha", wat in Middel-Nederlands "Erde" geword het en toe "Aarde" in Nederlands en Afrikaans. Die standaard sterrekundige simbool vir die Aarde is 'n kruis binne-in 'n sirkel (). Daar word ook na die simbool as die wiel- of sonkruis verwys en dit word oor die algemeen as 'n voorstelling van die Aarde se vier windstreke gesien.
↑ Hierdie meting is deur die tuig Kaiko in Maart 1995 geneem en word as die akkuraatste meting beskou. Sien "7,000 m Class Remotely Operated Vehicle KAIKO 7000". Japan Agency for Marine-Earth Science and Technology (JAMSTEC). Besoek op 2008-06-07.
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1 2 Vir die opbou van die Aarde kan ook verwys word na byvoorbeeld Fowler (1990), p. 1-2 & 105; Duff (1993), p. 598; Stanley (1999), p. 14-16; of hierdie teks van E.C. Robertson op die webwerf van die USGS.
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Halfrondtes van die Aarde
Noordelike Halfrond • Suidelike Halfrond • Westelike Halfrond • Oostelike Halfrond • Landhalfrond • Waterhalfrond