La Paz

As air rises, the pressure decreases. It is this lower pressure at higher altitudes that causes the temperature to be colder on top of a mountain than at sea level.

At high altitudes, oxygen molecules are further apart because there is less pressure to “push” them together. This effectively means there are fewer oxygen molecules in the same volume of air as we inhale.

However, as you climb higher, this pressure decreases. Air particles get scattered about. Consequently, even the oxygen in the air gets scattered. So the same deep breath of air at high altitude gives you lesser oxygen content.

The Maldives

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London

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Brussels

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Bengaluru

By many accounts, the Republic of San Marino, one of the world’s smallest countries, is also the world’s oldest country. The tiny country that is completely landlocked by Italy was founded on September 3rd in the year 301 BCE.

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A subnational entity typically represents a division of the country proper, while a dependent territory is a legally separate territory that enjoys a greater degree of autonomy. As an example, Greenland is a dependent territory of Denmark, and Saint Helena is a dependent territory of the United Kingdom.