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The western part of the contiguous United States west of the 98th meridian, the mountains of the Pacific Northwest, the Willamette Valley, and the Sierra Nevada range are the wetter portions of the nation, with average rainfall exceeding 30 inches (760 mm) per year. The drier areas are the Desert Southwest, Great Basin, valleys of northeast ...
As Pangea rifted apart a new passive tectonic margin was born, and the forces that created the Appalachian, Ouachita, and Marathon Mountains were stilled. Weathering and erosion prevailed, and the mountains began to wear away. [10] By the end of the Mesozoic, the Appalachian Mountains had been eroded to an almost-flat plain. [10]
The Appalachian Mountains began to form 460 million years ago with the collision of tectonic plates, and finished their uplift around 230 million years ago. [11] During the Last Ice Age, ice covered much of northern North America, but the southern Appalachians remained ice-free. [ 7 ]
In winter, North Carolina is somewhat protected by the Appalachian Mountains to the west. Cold fronts from Canada are typically reduced in intensity by the mountains. However, occasionally cold air can move from the north or northeast, east of the Appalachian Mountains, from Arctic high pressure systems that settle over the Northeastern or New ...
The state's average annual temperature is 64 °F (18 °C). Temperatures tend to be warmer in the state's southern portion with its proximity to the Gulf of Mexico, while its northern portions, especially in the Appalachian Mountains in the northeast, tend to be slightly cooler. [2]
A lee side rain shadow from the Appalachian Mountains lowers annual precipitation across central portions of the state. [5] Inland sections average 40 inches (1,000 mm) to 50 inches (1,300 mm) of rainfall, while near the coast 50 inches (1,300 mm) to 60 inches (1,500 mm), and the Piedmont receives 70 inches (1,800 mm) to 80 inches (2,000 mm) of ...
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The mountains of North Carolina may be conveniently classed as four separate chains: The Great Smoky Mountains – also called the "Smokies". The Blue Ridge Mountains – North Carolina's largest mountain range, the Blue Ridge run across the state in a very tortuous course and often shoot out in spurs of great elevation over the surrounding ...