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The average albedo of Earth is about 0.3. [15] This is far higher than for the ocean primarily because of the contribution of clouds. Earth's surface albedo is regularly estimated via Earth observation satellite sensors such as NASA's MODIS instruments on board the Terra and Aqua satellites, and the CERES instrument on the Suomi NPP and JPSS.
Map of countries coloured according to their highest point. The following sortable table lists land surface elevation extremes by country or dependent territory. Topographic elevation is the vertical distance above the reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface.
This is a list of lists of places considered the most extreme by virtue of meeting some superlative geographical or physical criterion – e.g. farthest, highest, lowest, greatest, or least. Earth [ edit ]
A city can be defined as a conditionally contiguous urban area, without regard to territorial or other boundaries inside an urban area. UNICEF defines urban area as follows: The definition of "urban" varies from country to country, and, with periodic reclassification, can also vary within one country over time, making direct comparisons difficult.
This is a list of lists on the cities of present-day nations, states and dependencies. Countries are listed in bold under their respective pages, whereas territories and dependencies are not. Disputed and unrecognized countries are italicized.
List of cities with the most skyscrapers; List of cities with more than one commercial airport; List of city name changes; List of largest cities throughout history; List of national capitals; List of ghost towns by country; List of towns and cities with 100,000 or more inhabitants; Lists of city flags; World's most livable cities; Global city
El Alto in Bolivia is the highest-altitude city in the world. This list of the highest cities in the world includes only cities with a population greater than 100,000 inhabitants and an average height above sea level over 2,000 metres (6,600 ft).
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