作者：Sebastian Lopez 2 年以前
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Rivers have always been essential for human life and settlement. A source for drinking, the source of food, and a way to transfer goods from one place to another. They are essential in the environment of rainforest and wetlands.
The Yangtze holds the title of Asia’s longest river. The Yangtze has a momentous place in China’s history and culture, providing some of the country’s most fertile land as well as some of its most artistically inspiring scenery.
Where the Mekong river runs, the land is incredibly verdant shaping one of the richest areas of biodiversity on the planet. Thousands of species call its shores and waters home. Long an essential trade route the Mekong passes through, or close to, some of the region’s most important cities, including Vientiane, Phnom Penh and Saigon.
The Volga is the longest river in Europe. The waters of the Volga are used to irrigate the steppe regions of southern Russia. Because of its importance in the country, the Volga has mythological status in Russia, and many iconic sites are found along its banks
The Danube is the second-longest river in Europe. Travelers can experience many of the river's sights by embarking on a cruise along its waterways. Danube River Cruises, which are offered by Viking Cruises, typically stop in Cologne, Budapest, Nuremberg, Belgrade and Krems. Following the river is a way to experience several Eastern European cities in one trip. Famous monuments, such as the Hungarian Parliament, have been erected on its coast.
The Volga is the longest river in Europe with a catchment area of 1,350,000 square km.
Eleven of the twenty largest cities of Russia, including the capital, Moscow, are located in the Volga's drainage basin. Rising in the Valdai Hills 225 meters above sea level northwest of Moscow and about 320 km southeast of Saint Petersburg, the Volga heads east past Lake Sterzh, Tver, Dubna, Rybinsk, Yaroslavl, Nizhny Novgorod, and Kazan. From there it turns south, flows past Ulyanovsk, Tolyatti, Samara, Saratov, and Volgograd, and discharges into the Caspian Sea.
Tributaries: Kama, Oka, Vetluga, and Sura. The Volga Delta has a length of about 160 kilometers and includes as many as 500 channels and smaller rivers.
· Posible inestabilidad de las proteínas modificadas genéticamente
· Posibles alergias a los transgénicos para humanos y animales.
· Posible resistencia a antibióticos
· Uso de virus en las modificaciones genéticas lo cual supone un riesgo posible
· Alteraciones del contenido nutritivo de los alimentos
· Posible presencia de efectos tóxicos que pueden llegar a ser letales en humanos y animales
· Posibles alteraciones no planeadas en las plantas
· Contaminación de otras plantas compatibles, especies silvestres o especies ancestrales generando problemas ecológicos
· Posibles efectos nocivos en polinizadores (como abejas y catarinas)
· Posible riesgo de que los alimentos transgénicos promuevan la resistencia a plagas o se acumulen en cadenas alimenticias
There are four major rivers in Africa: the Nile, the Zambezi, the Congo, and the Niger. The Nile is one of the longest rivers in the world.
The Zambezi's most noted feature is Victoria Falls. Other notable falls include the Chavuma Falls at the border between Zambia and Angola, and Ngonye Falls, near Sioma in Western Zambia.
North America
In the 18th century, the river was the primary western boundary of the young United States, and since the country's expansion westward, the Mississippi River has been widely considered a convenient dividing line between the Eastern, Southern, Midwestern United States, and the Western United States.
South America
Amazon River, the greatest river of South America and the largest drainage system in the world in terms of the volume of its flow and the area of its basin.
