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A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...
List of countries and dependencies by area. Dymaxion map of the world with the 30 largest countries and territories by area. This is a list of the world's countries and their dependencies by land, water, and total area, ranked by total area. The entries in this list include, but are not limited to, those in the ISO 3166-1 standard, which ...
Earth's surface is the boundary between the atmosphere, and the solid Earth and oceans. Defined in this way, it has an area of about 510 million km 2 (197 million sq mi). [12] Earth can be divided into two hemispheres: by latitude into the polar Northern and Southern hemispheres; or by longitude into the continental Eastern and Western hemispheres.
Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [ 7] With 1.4 billion people [ 1][ 2] as of 2021, it accounts for about 18% of the world's human population.
Specific surface area ( SSA) is a property of solids defined as the total surface area (SA) of a material per unit mass, [ 1] (with units of m 2 /kg or m 2 /g). Alternatively, it may be defined as SA per solid or bulk volume [ 2][ 3] (units of m 2 /m 3 or m −1 ). It is a physical value that can be used to determine the type and properties of ...
The total mass of Earth's hydrosphere is about 1.4 × 10 18 tonnes, ... Approximately 71% of Earth's surface, an area of some 361 million square kilometres (139.5 ...
Area: 42,549,000 km 2 (16,428,000 sq mi) Population: ... Along with their associated islands, the Americas cover 8% of Earth's total surface area and 28.4% of its ...
Asia is the largest continent on Earth. It covers 9% of the Earth's total surface area (or 30% of its land area), and has the longest coastline, at 62,800 kilometres (39,022 mi). Asia is generally defined as comprising the eastern four-fifths of Eurasia.
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