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Each region or region-point in the grid is called a cell. When each cell of a grid is subject to a recursive partition, resulting in a "series of discrete global grids with progressively finer resolution", [ 2 ] forming a hierarchical grid, it is called a hierarchical DGG (sometimes "global hierarchical tessellation" [ 3 ] or "DGG system").
Earth's crust and mantle, Mohorovičić discontinuity between bottom of crust and solid uppermost mantle. Earth's mantle extends to a depth of 2,890 km (1,800 mi), making it the planet's thickest layer. [20] [This is 45% of the 6,371 km (3,959 mi) radius, and 83.7% of the volume - 0.6% of the volume is the crust].
To change this template's initial visibility, the |state= parameter may be used: {{Regions of the world | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Regions of the world | state = expanded}} will show the template expanded, i.e. fully visible.
The parameters align (left, center, or, by default, right) and size (default 300px width) may be used to set the template's horizontal position and the image's size per, respectively, the Location and Size entries here. The parameter heading may be used to replace the default "The seven continents of Earth" heading.
The five main latitude regions of Earth's surface comprise geographical zones, [1] divided by the major circles of latitude. The differences between them relate to climate. They are as follows: The North Frigid Zone, between the North Pole at 90° N and the Arctic Circle at 66°33′50.3″ N, covers 4.12% of Earth's surface.
A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.
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The Pacific Ocean cell plays a particularly important role in Earth's weather. This entirely ocean-based cell comes about as the result of a marked difference in the surface temperatures of the western and eastern Pacific. Under ordinary circumstances, the western Pacific waters are warm, and the eastern waters are cool.