The american civil war started 1861 and ended 1865
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a concave lens is exactly the opppostie with outer surfaces curving inward, so it makes parallel light rays curve outward or diverge. That's why concave lenses are sometimes called diverging lenses. ... The distance from the center of the lens to the focal point is, again, the focal length of the lens.
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Political Maps - does not show physical features. Instead, they show state and national boundaries and capital and major cities. Physical Maps - illustrate the physical features of an area, such as the mountains, rivers and lakes. Topographic Maps - include contour lines to show the shape and elevation of an area.
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The main disadvantages of such a system are the lack of checks and balances, which drives regimes to misuse and excesses of power and eventually brings about disorder and inefficiency.
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