Sir halford mackinder developed what would become known as the heartland theory which suggested that interior eurasia contained a critical ""pivot area"" that would generate a state capable of challenging for world domination. the key to the area according to mackinder

The answer is Natural Protection.

Explanation:

Sir Halford Mackinder developed what would become known as the heartland theory which suggested that interior Eurasia contained a critical ""pivot area"" that would generate a state capable of challenging for world domination. The key to the area according to Mackinder wasNATURAL PROTECTION.

Mackinder is broadly recognized as the most important proponent of classical geopolitics, and his essays about the Pivot of History and Heartland are referred to in virtually all geopolitical texts. His ideas were relevant for contemporary Russia.

a maximum–minimum thermometer. the scales are fahrenheit on the inside of the u and celsius on the outside. the current temperature is 23 degrees celsius, the maximum recorded is 25, and the minimum is 15, both read from the base of the small markers in each arm of the u tube. the bulbs are hidden by a plastic housing.

six's thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. it is used to record the extremes of temperature at a location, for instance in meteorology and horticulture. it was invented by a british scientist james six, born in canterbury, in 1780; [1] the same basic design remains in use.

it is also commonly known as a maximum–minimum, minimum–maximum, maxima–minima or minima–maxima thermometer, of which it is the earliest practical design.

the thermometer indicates the current temperature, and the highest and lowest temperatures since last reset.

c. 2,000 bce

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