Вставьте артикль, где необходимо The Grand Canyon is ... geological and scenic won- der that is known throughout ... world. Located in ... United States in ... Northern Arizona, it is 446 kilo- metres long, up to 29 kilometres wide and has... depth of up to 1.8 kilometres. The Grand Canyon is ... world-famous geological site. ... canyon's walls contain rock layers that expose nearly two billion years of ... Earth's history. Geologic studies began in .. 19th century and continue today. One of ... biggest questions is how ... Colorado River chose its course and began carving ... canyon. ... area contains several major ecosystems and is home to over 1500 plant and over 400 animal species. For thousands of years, ... area has been inhabited by ... Native Americans. In the early 1800s, ... United States government started to send expeditions to explore and map ... canyon. protection in 1893 as ... forest reserve. Later, in 1919, it received national park status. Today . Grand Canyon National Park receives almost five million visitors each year.
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