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The United States loses almost 3 tons of topsoil per acre per year. [16] 1 inch (2.5 cm) of topsoil can take between 500 [17] and 1,000 years [18] to form naturally, making the rate of topsoil erosion a serious ecological concern. Based on 2014 trends, the world has about 60 years of topsoil left.
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The concentration of organic nitrogen ranged between < 0.19 and 0.25 milligrams per liter and the concentration of organic carbon ranged from 2.1 t to 2.2 milligrams per liter. The concentration of ammonia in filtered water was less than or equal to 0.02 milligrams per liter in two measurements and the nitrate concentration was half that in two ...
Pennsylvania is one of 13 original colonies that share a border with Canada. Pennsylvania is 180 miles (290 km) north to south and 310 miles (500 km) east to west. The total land area is 44,817 square miles (116,080 km 2)—739,200 acres (2,991 km 2) of which are bodies of water. It is the 33rd largest state in the United States.
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[14] [15] [16] Although soil restoration in post mining land brings many challenges, it also bring opportunities. For example it is noteworthy that the rate of soil carbon storage on post mining soil can be very high and may exceed the rate of carbon storage one may gain, e.g., by reforestation of arable land. [17] [18]
As the name implies, the streams of this area have cut deep valleys with steep sided-slopes on the surrounding ridges. Some of the gorges are at least 1,000 feet (305 m) deep. Much of the area was forested at the end of the 19th century, and much of the area is owned by the Pennsylvania Bureau of Forestry.
The population density was 3,215.6 inhabitants per square mile (1,241.6/km 2). There were 2,533 housing units at an average density of 1,390.4 units per square mile (536.8 units/km 2 ). The racial makeup of the borough was 62.03% White , 31.12% African American , 0.22% Native American , 0.65% Asian , 0.03% Pacific Islander , 2.41% from other ...
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