Топик: Alabama state

The Appalachian Ridge and Valley Region is made up of narrow valleys between steep mountain ridges. It is known for its mineral riches and forests of oak and pine.

The Piedmont Plateau is a wedge-shaped area southeast of the Ridge and Valley Region. It gets its name from the word pied-mont, which means "lying at the base, or foot, of mountains." This region is generally hilly, with some rolling land. The most rugged part is in the northwest, where Cheaha Mountain rises to 734 meters (2,407 feet).

The Gulf Coastal Plain is mainly a flat to rolling plain. Ages ago it was covered by oceans. The part adjoining the Appalachian

Highlands is called the Upper Coastal Plain. This is the oldest part, as well as the highest in elevation. South of it is a strip of nearly level land known as the Black Belt because of its dark-colored soils. The southeastern quar­ter of the state is known as the Wire Grass area because it was once covered with a kind of coarse grass called wire grass.

For many years the Coastal Plain was the heart of the cotton fields. It is changing gradually to an area where livestock graze and many different crops are grown.

Rivers, Lakes, and Coastal Waters

Alabama is drained by three major river systems. The Tennessee River dips down' into Alabama from the state of Tennessee. It flows westward through northern Alabama and then northward to join the Ohio River. The other major rivers of Alabama flow toward the Gulf of Mexico. The Mobile River system is made up of several important rivers. The Tombigbee River and its main tributary, the Black Warrior River, drain the western part of the state. The Coosa and the Talla-poosa rivers flow through east central and eastern Alabama. They join near Montgomery to form the Alabama River, which flows southwestward toward the Tombigbee. North of Mobile, the Alabama and the Tombigbee rivers join to form the Mobile River, which drains southward into Mobile Bay. The Chat-tnhoochee is the major river of southeastern Alabama. Guntcrsvillc Lake is the largest of the many lakes in the state.

The Tennessee-Tombigbee (Tenn-Tom) Waterway project was designed to provide a water route from the Tennessee Valley to the Gulf of Mexico, by way of the Tombigbee River. It includes a canal in the northeastern corner of Mississippi that links the rivers.

Alabama's general coastline on the Gulf of Mexico is 85 kilometers (53 miles) long. If the shorelines of inlets, bays, and offshore islands are added, the total shoreline is 977 kilometers (607 miles).

Climate

People sometimes think of Alabama as an uncomfortably hot, tropical state, but this impression is false. Actually, there is a wide variety of climate from the highlands of the north to the beaches of the Gulf of Mexico.

Winter temperatures in the southern half of the state rarely drop below freezing. Snow is so rare that many children have never seen a snowfall. In the northern part of the state, winters are not so mild. Northwest winds bring cold snaps, but they are usually short and are followed by mild weather.

Summer temperatures tend to be about the same over the state. The summer is long, but extended heat waves are almost unknown. Along the coast the hot days are relieved by frequent breezes blowing in from the Gulf of Mexico. Nights are cool and comfortable even in midsummer. In the north, summer temperatures are relieved by the higher altitudes and by cool forest shade. Spring and autumn are long and delightful. Autumn extends from early September to well after Thanksgiving.

THE LAND

LOCATION: Latitude —30° 13' N to 35" N

.Longitude — 84" to 53' W to 88° 28' W.

Tennessee to the north, Mississippi on the west, the Florida panhandle and the Gulf of Mexico to the south, Georgia on the east.

ELEVATION: Highest —Cheaha Mountain, 734 m (2,407 ft). Lowest—Sea level, along the Gulf of Mexico.

LANDFORMS: Highlands (the Interior Low Plateau and the Appalachian Highlands) in the northern part of the state; lowlands (the Gulf Coastal Plain) in the south and west.

SURFACE WATERS : Major rivers —Tennessee; Tombigbee, with its main tributary, the Black Warrior; Coosa and Tallapoosa, which join to form the Alabama; Mobile, formed by the joining of the Alabama and the Tombigbee;

Chattahoochee. Major artificial lakes —Pickwick, Wilson, Wheeler, and Guntersville, on the Tennessee River; Lay, Mitchell, Weiss, and Jordan, on .the Coosa; Martin and Thurlow, on the Tallapoosa; Holt Reservoir on the Black Warrior.

CLIMATE : Temperature —July average, about 27°C (80°F) statewide. January average, about 7°C (44°F) in north, 12°C (53°F) in south. Precipitation —Rainfall average, 1,350 mm (53 in); varies from 1,320 mm (52 in) in north to 1,730 mm (68 in) along the coast. Growing season —Varies from about 200 days in north to 300 days in south.

Natural Resources

Leaders of the state like to say that Alabama has more natural resources than any other area of its size in the world. These resources include soils, minerals, forests, and water.

Soils. Alabama may be divided into several major soil areas. Along the Coosa and the Tennessee rivers, there are valleys called limestone valleys. The soils in these valleys are mainly red clay loams. They were formed by the weathering of limestone rock. The soils of the Appalachian Plateau are mainly sandy loams. Red sandy loams and clay loams cover much pf the Piedmont Plateau. The soils of the Gulf Coastal Plain were formed from sediment laid down in the oceans that once covered the plain. Most of these soils are sandy loams or clay soils.

Long years of growing cotton and corn lowered the fertility of Alabama's soils. The abundant rainfall also caused the topsoil to be washed away. In many places, especially in the Piedmont Plateau and the Black Belt, farms are now planted in grasses to improve the soil and provide pasture for cattle.

Forests. About 60 per cent of all the land of Alabama is forested. Many kinds of trees are found, but the soft pine is the most common. It is also the most valuable for wood pulp, which is used for making paper. The pine forests grow mainly in the central and southern parts of the state.

To improve worn-out soils, farmers have developed many tree farms for future harvest. Paper companies, farmers, and the government all help in a continuing program of reforestation.

Minerals. Most of Alabama's minerals are in the northern half of the state. Coal and iron ore are found in the Appalachian Plateau and in the Ridge and Valley Region. One of the largest deposits, or fields, of coal is the Warrior field. It extends through all of Walker County and parts of Fayette, Tuscaloosa, and Jefferson counties. Some of the best beds of iron ore are in the Birmingham area.

Limestone occurs in the Tennessee Valley and in the Ridge and Valley Region, as well as in areas of the Gulf Coastal Plain. Marble is found in Coosa and Talladega counties.

Petroleum is the most important mineral of the Gulf Coastal Plain. It has been found in the extreme southwestern counties. There are important salt deposits north of Mobile. Henry and Barbour counties, as well as other parts of the state, have deposits of bauxite, a claylike mineral from which aluminum is obtained.

POPULATION TOTAL : 3,893,888 (1980 census). Density —29.6 persons to each square kilometer (76.7 persons to each square mile). GROWTH SINCE 1820 Year Population Year Population « 1 2 3 4 5 6 7 » К-во Просмотров: 604 Бесплатно скачать Топик: Alabama state >>> Скачать <<< Меню Поиск