Атмосфера: состав и строение

Земля окружена слоем газов, что называются атмосферой. Атмосфера очень важна для жизни на Земле и делает многое, чтобы защитить и помочь человечеству жить.

Структура Земли

Может показаться, что Земля – это один большой кусок твердой скалы, но она состоит из нескольких частей. Некоторые из них постоянно движутся!

Африканские страны - Рефераты по географии

Рефераты по географии > Африканские страны
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Ghana Well endowed with natural resources, Ghana has twice the per capita output of the poorer countries in West Africa. Even so, Ghana remains heavily dependent on international financial and technical assistance. Gold, timber, and cocoa production are major sources of foreign exchange. The domestic economy continues to revolve around subsistence agriculture, which accounts for 40% of GDP and employs 60% of the work force, mainly small landholders. In 1995-97, Ghana made mixed progress under a three-year structural adjustment program in cooperation with the IMF. On the minus side, public sector wage increases and regional peacekeeping commitments have led to continued inflationary deficit financing, depreciation of the cedi (national currency), and rising public discontent with Ghana's austerity measures. A rebound in gold prices is likely to push growth over 5% in 2000-01.

Kenya. Kenya is well placed to serve as an engine of growth in East Africa, but its economy is stagnating because of poor management and uneven commitment to reform. In 1993, the government of Kenya implemented a program of economic liberalization and reform that included the removal of import licensing, price controls, and foreign exchange controls. With the support of the World Bank, IMF, and other donors, the reforms led to a brief turnaround in economic performance following a period of negative growth in the early 1990s. Kenya's real GDP grew 5% in 1995 and 4% in 1996, and inflation remained under control. Growth slowed in 1997-99 however. Political violence damaged the tourist industry, and Kenya's Enhanced Structural Adjustment Program lapsed due to the government's failure to maintain reform or address public sector corruption. A new economic team was put in place in 1999 to revitalize the reform effort, strengthen the civil service, and curb corruption, but wary donors continue to question the government's commitment to sound economic policy. Long-term barriers to development include electricity shortages, the government's continued and inefficient dominance of key sectors, endemic corruption, and the country's high population growth rate.

Lesotho. Small, landlocked, and mountainous, Lesotho's only important natural resource is water. Its economy is based on subsistence agriculture, livestock, and remittances from miners employed in South Africa. The number of such mine workers has declined steadily over the past several years. In 1996 their remittances added about 33% to GDP compared with the addition of roughly 67% in 1990. A small manufacturing base depends largely on farm products which support the milling, canning, leather, and jute industries. Agricultural products are exported primarily to South Africa. Proceeds from membership in a common customs union with South Africa form the majority of government revenue. Although drought has decreased agricultural activity over the past few years, completion of a major hydropower facility in January 1998 now permits the sale of water to South Africa, generating royalties that will be an important source of income for Lesotho. The pace of parastatal privatization has increased in recent years. Civil disorder in September 1998 destroyed 80% of the commercial infrastructure in Maseru and two other major towns. Most firms were not covered by insurance, and the rebuilding of small and medium business has been a significant challenge in terms of both economic growth and employment levels. Output dropped 10% in 1998 and recovered slowly in 1999.

Mozambique. Before the peace accord of October 1992, Mozambique's economy was devastated by a protracted civil war and socialist mismanagement. In 1994, it ranked as one of the poorest countries in the world. Since then, Mozambique has undertaken a series of economic reforms. Almost all aspects of the economy have been liberalized to some extent. More than 900 state enterprises have been privatized. Pending are tax and much needed commercial code reform, as well as greater private sector involvement in the transportation, telecommunications, and energy sectors. Since 1996, inflation has been low and foreign exchange rates stable. Albeit from a small base, Mozambique's economy grew at an annual 10% rate in 1997-99, one of the highest growth rates in the world. Still, the country depends on foreign assistance to balance the budget and to pay for a trade imbalance in which imports outnumber exports by five to one or more. The medium-term outlook for the country looks bright, as trade and transportation links to South Africa and the rest of the region are expected to improve and sizable foreign investments materialize. Among these investments are metal production (aluminum, steel), natural gas, power generation, agriculture (cotton, sugar), fishing, timber, and transportation services. Additional exports in these areas should bring in needed foreign exchange. In addition, Mozambique is on track to receive a formal cancellation of a large portion of its external debt through a World Bank initiative.

Rwanda. Rwanda is a rural country with about 90% of the population engaged in (mainly subsistence) agriculture. It is the most densely populated country in Africa; is landlocked; and has few natural resources and minimal industry. Primary exports are coffee and tea. The 1994 genocide decimated Rwanda's fragile economic base, severely impoverished the population, particularly women, and eroded the country's ability to attract private and external investment. However, Rwanda has made significant progress in stabilizing and rehabilitating its economy. GDP has rebounded, and inflation has been curbed. In June 1998, Rwanda signed an Enhanced Structural Adjustment Facility (ESAF) with the IMF. Rwanda has also embarked upon an ambitious privatization program with the World Bank. Continued growth in 2000 depends on the maintenance of international aid levels and the strengthening of world prices of coffee and tea.

Zambia. Despite progress in privatization and budgetary reform, Zambia's economy has a long way to go. The recent privatization of the huge government-owned Zambia Consolidated Copper Mines (ZCCM) should greatly improve Zambia's prospects for international debt relief, as the government will no longer have to cover the mammoth losses generated by that sector. Inflation and unemployment rates remain high, however.

Zimbabwe. The government of Zimbabwe faces a wide variety of difficult economic problems as it struggles to consolidate earlier progress in developing a market-oriented economy. Its involvement in the war in the Democratic Republic of the Congo, for example, has already drained hundreds of millions of dollars from the economy. Badly needed support from the IMF suffers delays in part because of the country's failure to meet budgetary goals. Inflation rose from an annual rate of 32% in 1998 to 59% in 1999. The economy is being steadily weakened by AIDS; Zimbabwe has the highest rate of infection in the world. Per capita GDP, which is twice the average of the poorer sub-Saharan nations, will increase little if any in the near-term, and Zimbabwe will suffer continued frustrations in developing its agricultural and mineral resources.

So the generalization is obvious. The countries which have the highest GDP per capita are oil, gas as well as other raw materials exporters. Almost none of the countries has stable source of incomes. Oil exporters are in a better condition then the last, but it has a number of negative consequences. The first is that their economy are heavily dependant on the oil prices. The next is that even the richest resources may be easily wasted if the incomes are not managed properly. The corruption in a government, continuous possibility of warfare wouldn’t let foreign capital flow easily into these countries. Even the oil fields couldn’t attract investitions if there’s no political stability. Though the most population of these countries are involved in agriculture the most of them couldn’t provide enough food for themselves. The reason is simple lack of water resources. A number of countries having a lot of resources are not able to use them efficently because of continuous warfares, which are draining budgets. These are the major negative facts considering African economy, but there are a lot of positive ones.

According to ECA’s "Africa Economic Report 2000" shows, for five years running, Africa's GDP has grown faster than its population, reversing the falling living standards of the previous 15 years. While growth trends for the region as a whole remain depressed, some African countries are doing well. Fourteen countries have grown on average by 4 percent a year during the 1990s, with rising annual incomes of 2-3 percent and even higher, with another 10 countries following close behind with growth rates above 3 percent a year. Some countries have grown at 7 percent a year or higher (Mozambique, 7 percent, and Uganda, 7.1 percent). "These figures show us that economic reforms over recent years have slowly but surely improved growth in many African countries and allowed the private sector to take root," says Alan Gelb, Chief Economist of the World Bank's Africa region. "However, despite this rising trend, countries are still vulnerable to conflict and external shocks in world markets, such as the recent rapid increase in oil prices and fallout from the East Asia crisis. These two forces have together produced highly unfavorable terms of trade for oil importers."