资讯

The first map of the United States drawn and printed in America by an American was ... toward French and Spanish possessions on the continent, extend west of the Mississippi River—"Manifest ...
Find out what pupils know about North America. Do they know where it ... Give pupils an outline map of the continent and ask them to draw and write features inside that they think they might ...
Beneath the crust of North America, scientists have found that the deep roots of the continent are slowly dripping away in ...
America has had two great ages of exploration ... can prove that the continental shelf—the submerged portion of a continent—extends beyond their EEZ and meets certain other conditions.