精选优质文档-倾情为你奉上Survey of the USA Foundation: 1776.7.4. The fourth largest country in the worldPosition: the central part of North America; Alaska in the northwestern part of North America and Hawaii inthe central Pacific Ocean.Northern temperature zone.North: Canada; South: Mexico, the Gulf of Mexico; East: Atlantic Ocean; West: Pacific OceanArea: 6% of the Earth the whole Europe (三大河流体系)The three river systems in the USA are: the system of the Gulf of Mexico, the system of the A
