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Fall Line
A fall line (or fall zone) is the area where an upland region and a coastal plain meet and is noticeable especially the place rivers cross it, with resulting rapids or waterfalls. The uplands are relatively hard crystalline basement rock, and the coastal plain is softer sedimentary rock. A fall line often will recede upstream as a river cuts out the uphill dense material, forming "c"-shaped waterfalls and exposing bedrock shoals. Due to these features, riverboats typically cannot travel any further inland without portaging, unless locks are built. The rapid change of elevation of the water and resulting energy release make the fall line a good location for water mills, grist mills, and sawmills. Seeking a head of navigation with a ready supply of water power, people have long made settlements where rivers cross a fall line. Geography The slope of rivers crossing fall zones affected settlement patterns. For example, the fall line represents the inland limit of navigation of ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coastal Plain
A coastal plain (also coastal plains, coastal lowland, coastal lowlands) is an area of flat, low-lying land adjacent to a sea coast. A fall line commonly marks the border between a coastal plain and an upland area. Formation Coastal plains can form in one of two ways; some begin as a continental shelf, a flat piece of land located below sea level, and are created when the ocean level falls, exposing the land. Others develop when river currents carry sediment into the ocean, which is deposited and builds up over time until it forms a coastal plain. They are generally separated from the rest of the interior by proximate landforms, like mountains. Locations Some of the largest coastal plains are in Alaska and the southeastern United States. The Gulf Coastal Plain of North America extends northwards from the Gulf of Mexico along the Lower Mississippi River to the Ohio River, which is a distance of about . The Atlantic Coastal Plain runs from the New York Bight to Florida. The C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a Fracture (geology), planar fracture or discontinuity in a volume of Rock (geology), rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust (geology), crust result from the action of Plate tectonics, plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction, subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the Plane (geometry), plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geological maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philadelphia
Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the United States, with a population of 1,603,797 in the 2020 United States census, 2020 census. The city is the urban core of the Philadelphia metropolitan area (sometimes called the Delaware Valley), the nation's Metropolitan statistical area, seventh-largest metropolitan area and ninth-largest combined statistical area with 6.245 million residents and 7.379 million residents, respectively. Philadelphia was founded in 1682 by William Penn, an English Americans, English Quakers, Quaker and advocate of Freedom of religion, religious freedom, and served as the capital of the Colonial history of the United States, colonial era Province of Pennsylvania. It then played a historic and vital role during the American Revolution and American Revolutionary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delaware River
The Delaware River is a major river in the Mid-Atlantic region of the United States and is the longest free-flowing (undammed) river in the Eastern United States. From the meeting of its branches in Hancock, New York, the river flows for along the borders of New York, Pennsylvania, New Jersey, and Delaware, before emptying into Delaware Bay. The river has been recognized by the National Wildlife Federation as one of the country's Great Waters and has been called the "Lifeblood of the Northeast" by American Rivers. Its watershed drains an area of and provides drinking water for 17 million people, including half of New York City via the Delaware Aqueduct. The Delaware River has two branches that rise in the Catskill Mountains of New York: the West Branch at Mount Jefferson in Jefferson, Schoharie County, and the East Branch at Grand Gorge, Delaware County. The branches merge to form the main Delaware River at Hancock, New York. Flowing south, the river re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trenton, New Jersey
Trenton is the List of capitals in the United States, capital city of the U.S. state of New Jersey and the county seat of Mercer County, New Jersey, Mercer County. It was the federal capital, capital of the United States from November 1 until December 24, 1784.New Jersey County Map , New Jersey Department of State. Accessed July 10, 2017. Trenton and Princeton, New Jersey, Princeton are the two principal cities of the Trenton–Princeton metropolitan statistical area, which encompasses those cities and all of Mercer County for statistical purposes and constitutes part of the New York metropolitan area#Combined statistical area, New York combined statistical area by the United States Census Bureau, U.S. Census Bureau. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passaic River
The Passaic River ( or ) is a river, approximately long, in North Jersey, northern New Jersey. The river in its upper course flows in a highly circuitous route, meandering through the swamp lowlands between the ridge hills of rural and suburban northern New Jersey, called the Great_Swamp_National_Wildlife_Refuge, Great Swamp, draining much of the northern portion of the state through its tributaries. In its lower (southern) portion, it flows through the most Urban area, urbanized and industrialized areas of the state, including along Downtown Newark, Downtown Newark, New Jersey, Newark. The lower river suffered from severe water pollution, pollution and industrial abandonment in the 20th century. In April 2014, the U.S. Environmental Protection Agency (EPA) announced a $1.7 billion plan to remove of toxic mud from the bottom of lower of the river. It is considered List of most-polluted rivers, one of the most polluted stretches of water in the nation, and the project is one ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paterson, New Jersey
Paterson ( ) is the largest City (New Jersey), city in and the county seat of Passaic County, New Jersey, Passaic County, in the U.S. state of New Jersey.New Jersey County Map New Jersey Department of State. Accessed July 10, 2017. As of the 2020 United States census, Paterson was List of municipalities in New Jersey, the state's third-most-populous municipality,Table1. New Jersey Counties and Most Populous Cities and Townships: 2020 and 2010 Censuses New Jersey Department of Labor and Workforce Development. Accessed Dec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potomac River
The Potomac River () is in the Mid-Atlantic (United States), Mid-Atlantic region of the United States and flows from the Potomac Highlands in West Virginia to Chesapeake Bay in Maryland. It is long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map. Retrieved August 15, 2011 with a Drainage basin, drainage area of , and is the fourth-largest river along the East Coast of the United States. More than 6 million people live within its drainage basin, watershed. The river forms part of the borders between Maryland and Washington, D.C., on the left descending bank, and West Virginia and Virginia on the right descending bank. Except for a small portion of its headwaters in West Virginia, the #North Branch Potomac River, North Branch Potomac River is considered part of Maryland to the low-water mark on the opposite bank. The South Branch Potomac River lies completely within the state of West Virginia except for its headwaters, which lie i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James River
The James River is a river in Virginia that begins in the Appalachian Mountains and flows from the confluence of the Cowpasture and Jackson Rivers in Botetourt County U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map , accessed April 1, 2011 to the Chesapeake Bay. The river length extends to if the Jackson River (Virginia), Jackson River, the longer of its two headwaters, is included. It is the longest river in Virginia. Jamestown, Virginia, Jamestown and Williamsburg, Virginia, Williamsburg, Virginia's first colonial capitals, and Richmond, Virginia, Richmond, Virginia's current capital, lie on the James River. History The Native American tribes in Virginia, Native Americans who populated the area east of the Atlantic Seaboard Fall Line, Fall Line in the late 16th and early 17th centuries called the James River the Powhatan River, named for the Powhatan, Powhatans who occupied the area. The Jamestown, Virginia, Jamestown colo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richmond, Virginia
Richmond ( ) is the List of capitals in the United States, capital city of the Commonwealth (U.S. state), U.S. commonwealth of Virginia. Incorporated in 1742, Richmond has been an independent city (United States), independent city since 1871. The city's population in the 2020 United States census was 226,610, up from 204,214 in 2010, making it Virginia's List of cities and counties in Virginia#Largest cities, fourth-most populous city. The Greater Richmond Region, Richmond metropolitan area, with over 1.3 million residents, is the Commonwealth's Virginia statistical areas, third-most populous. Richmond is located at the Atlantic Seaboard fall line, James River's fall line, west of Williamsburg, Virginia, Williamsburg, east of Charlottesville, Virginia, Charlottesville, east of Lynchburg, Virginia, Lynchburg and south of Washington, D.C. Surrounded by Henrico County, Virginia, Henrico and Chesterfield County, Virginia, Chesterfield counties, Richmond is at the intersection o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Little Falls (Potomac River)
Little Falls is an area of rapids located where the Potomac River crosses the Atlantic Seaboard fall line where Washington, DC; Maryland; and Virginia meet. Descending from the harder and older rocks of the Piedmont Plateau to the softer sediments of the Atlantic coastal plain, it is the first upstream "cataract", or barrier, to navigation encountered on the Potomac River. It may be viewed from the heavily trafficked Chain Bridge, about a half mile downstream. It is named in contradistinction to Great Falls, about 5 miles further upstream. Captain John Smith (1580–1631) of England was the first European to explore the Potomac as far as Little Falls. When he arrived there in 1608 he noted that "as for deer, buffaloes, bears and turkeys, the woods do swarm with them and the soil is extremely fertile."Gernand and Netherton, ''Falls Church'', p. 13, citing Fairfax Harrison, ''The Landmarks of Old Prince William'', pp. 143, 148. By 1757, the name of a nearby Anglican Church buil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sediment
Sediment is a solid material that is transported to a new location where it is deposited. It occurs naturally and, through the processes of weathering and erosion, is broken down and subsequently sediment transport, transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand and silt can be carried in suspension (chemistry), suspension in river water and on reaching the sea bed deposited by sedimentation; if buried, they may eventually become sandstone and siltstone (sedimentary rocks) through lithification. Sediments are most often transported by water (fluvial, fluvial processes), but also wind (aeolian processes) and glaciers. Beach sands and stream channel, river channel deposits are examples of fluvial transport and deposition (geology), deposition, though sediment also often settles out of slow-moving or standing water in lakes and oceans. Desert sand dunes and loess are examples of aeolian transport and deposition. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
