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A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, and the material used to make it, and the funds available to build it.
The Americas, which are sometimes collectively called America, are a landmass comprising the totality of North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World. Along with their associated islands, the Americas cover 8% of Earth's total surface area and 28. 4% of its land area. The topography is dominated by the American Cordillera, a long chain of mountains that runs the length of the west coast. The flatter eastern side of the Americas is dominated by large river basins, such as the Amazon, St. Lawrence River–Great Lakes basin, Mississippi, and La Plata. Since the Americas extend 14,000 km (8,700 mi) from north to south, the climate and ecology vary widely, from the arctic tundra of Northern Canada, Greenland, and Alaska, to the tropical rain forests in Central America and South America. Countries in America are U. S. A. , Mexico, Canada, Guatemala, Haiti, Cuba, Dominican Republic, Honduras, Nicaragua, El Salvador, Costa Rica, Panama, Jamaica, Puerto Rico, Trinidad and Tobago, Guadeloupe, Belize, Bahamas, Martinique, Barbados, Saint Lucia, Curaçao, Grenada, Saint Vincent and the Grenadines, Aruba, United States Virgin Islands, Antigua and Barbuda, Dominica, Cayman Islands, Bermuda, Greenland, Saint Kitts and Nevis, Sint Maarten, Turks and Caicos Islands, Saint Martin, British Virgin Islands, Caribbean Netherlands, Anguilla, Saint Barthélemy, Saint Pierre and Miquelon, Montserrat, Brazil, Colombia, Argentina, Peru, Venezuela, Chile, Ecuador, Bolivia, Paraguay, Uruguay, Guyana, Suriname, French Guiana, Falkland Islands.