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There is not only a physical difference between plugs, but also an issue of electrical incompatibility. There are various voltages as well as frequencies used throughout the world. For instance, the United States uses 110-120V (60 Hz), while in many other countries, 220-240V (50 Hz) is used. This is because the electrical standards were originally

The Köppen climate classification  divides climates into five main climate groups, with each group being further divided based on patterns of seasonal precipitation and temperature. The five main groups are A (tropical), B (arid), C (temperate), D (cold/continental), and E (polar). Click here to jump below to see a world view of all climates. Color