North America is an English-based American States (OAS). Located in the Americas, north, north of the Arctic Ocean, west Pacific, east Atlantic. Include Canada, the United States, Greenland. Three north-south column terrain area for the western high mountain, mountains, plateau, basin and white, mountains, the Americas and the Pacific plate collided from the central plains of the central Great Plains, the plateau of the eastern plateau mountain region of Labrador, Abba La Qiya mountain-based, low-lying.
North America, the Western coast, is part of the volcanic belt of the Pacific coast. North America more than 90 active volcanoes Block 28, including the Aleutian Islands, Alaska 20, Central America, more than 40. North America on the west is the world's frequent earthquakes and strong earthquake zone.
The outflow region of North America accounted for about 88% of the continental area, which is the Atlantic basin area of about 48% of the whole continent, the Pacific Basin, accounts for about 20%. In addition to the St. Lawrence River, all the rivers originate in the Rocky Mountains. Rivers east of the Rocky Mountains into the Atlantic Ocean and the Arctic Ocean, west of the rivers flow into the Pacific. Within the region of flow (flow area) accounted for about 12% of the continent-wide area, mainly in the western United States, Great Basin and Greenland. The Mississippi River is the largest river in North America, according to the length of the world's fourth largest river. Followed by the Mackenzie River, Yukon River, the St. Lawrence River and the Rio Grande. North American rivers, waterfalls, drop the biggest waterfall in the western United States, Yosemite National Park Yosemite Falls, a drop of 700 meters. Niagara Falls drop 51 meters wide and 1240 m. North America is a continent of many lakes, freshwater lakes of the total area of about 400,000 square kilometers, ranking first in all continents. The lakes are mainly distributed in the northern half of the mainland. The central plateau area of the Great Lakes: Lake Superior, Lake Huron, Lake Michigan, Lake Erie, Lake Ontario, with a total area of 245,273 square kilometers, is the world's largest freshwater lake group, the North American Mediterranean, "said. Lake Superior area for the world's largest freshwater lake