Автор: P**************@mail.ru, 25 Ноября 2011 в 20:23, реферат
The U.S. is divided into 50 states and 1 district. Most of the States in central North America, The total area is more than 9 and a half million sq. km. The world’s 3rd largest country. Three land borders: 2 with Canada and 1 with Mexico. The United States shares land borders with Canada (to the north) and Mexico (to the south), and a territorial water border with Russia in the northwest. The contiguous forty-eight states are otherwise bounded by the Pacific Ocean on the west, the Atlantic Ocean on the east, and the Gulf of Mexico to the southeast. Alaska borders the Pacific Ocean to the south, the Bering Strait to the west, and the Arctic Ocean to the north, while Hawaii lies far to the southwest of the mainland in the Pacific Ocean.
Physical Geography of the USA.
Regions.
Main Rivers
This is the hottest and high rainfall region of the US. You must be prepared to face heavy rains accompanied with thunder storms, dangerous lightening and occasional tornadoes. The winters are generally short but some freezing rains do occur. The spring and fall seasons are quite long and temperatures are generally excellent. The summers are very hot with temperatures approaching and exceeding 100 degree F on many days.
Warm clothes: You will need moderate warm clothes for winters. Raincoats are a must.
Natural resources: coal, copper, lead, molybdenum, phosphates, uranium, bauxite, gold, iron, mercury, nickel, potash, silver, tungsten, zinc, petroleum, natural gas, timber
Environmental Problems:
Habitat loss represents a major environmental issue which affects not only the biodiversity of ecosystems, but humans as well. A report by the U.S. Geological Survey identified grasslands, savannas, and barrens as the most critically endangered habitats in the United States, with losses up to 98 percent of the original habitat at European settlement. As a result, the Nature Conservancy estimates that 217 plant species and 71 animals special became extinct. With this loss of habitat, there is an increased risk of human-wildlife conflicts as populations struggle to meet their ecological needs.
Air pollution impacts every aspect of life in the United States and on the planet. Air pollution is so deadly because of its mobility. It can cause environmental issues far from its source, not unlike NSP. It can pollute the soil and aquatic resources through acid rain formation. It affects plants by negatively impacting their physiology, causing low crop yields and a reduction in plant vitality.Air pollution also affects humans. Pollutants in industrial emissions cause anything from minor throat irritation to aggravation of existing respiratory conditions, to an increased risk of cancer.
What
are some of the environmental issues in the United States? The problems
with the most widespread impacts represent some of the greatest threats.
These environmental issues show that national as well as local solutions
are necessary to reduce the impacts on the environment. It is only through
recognition of the existing problems and scrutiny of current practices
can solutions be developed. Acid rain is a serious environmental problem
that affects large parts of the United States and Canada. Acid rain
is particularly damaging to lakes, streams, and forests and the plants
and animals that live in these ecosystems.
Karaganda Medical State University
Chair
of Foreign Language
Report
“Geography
Of The USA”
Made by Student of Group № 155
Motokhov I.
Checked
by Zhereb T. V.
Karaganda 2011
Plan