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The magnetic equator is the line where the inclination is zero (the magnetic field is horizontal). The global definition of the Earth's field is based on a mathematical model. If a line is drawn through the center of the Earth, parallel to the moment of the best-fitting magnetic dipole, the two positions where it intersects the Earth's surface ...
English: This is a world map of magnetic declination created by the National Geophysical Data Center at NOAA. Français : Carte mondiale de la déclinaison magnétique terrestre créé par le centre national des donnée géophysiques ( NGDC ) de l'agence américaine responsable de l'étude de l'océan et de l'atmosphère ( NOAA ).
Magnetic anomalies off west coast of North America. Dashed lines are spreading centers on mid-ocean ridges. The Vine–Matthews-Morley hypothesis correlates the symmetric magnetic patterns seen on the seafloor with geomagnetic field reversals. At mid-ocean ridges, new crust is created by the injection, extrusion, and solidification of magma.
A magnetic compass points to magnetic north, not geographic (true) north. Compasses of the style commonly used for hiking (i.e., baseplate or protractor compass) utilize a dial or bezel which rotates 360 degrees and is independent of the magnetic needle. To manually establish a declination for true north, the bezel is rotated until the desired ...
Image:Canada_blank_map.svg — Canada. File:Blank US Map (states only).svg — United States (including Alaska and Hawaii). Each state is its own vector image, meaning coloring states individually is very easy. File:Blank USA, w territories.svg – United States, including all major territories.
Blank political world map with blue oceans, fit to replace File:A large blank world map with oceans marked in blue.PNG. Date: 25 July 2006: Source: World Map Blank.svg: Author: Petr Dlouhý: Other versions: Derivative works of this file: Carte Coffea robusta arabic.svg; Hantaviren weltweit.svg; OttomanEmpireIn1683.png
Original file (5,400 × 4,500 pixels, file size: 3.06 MB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The borders of the oceans are the limits of Earth's oceanic waters.The definition and number of oceans can vary depending on the adopted criteria. The principal divisions (in descending order of area) of the five oceans are the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern (Antarctic) Ocean, and Arctic Ocean.