Albania
mostly mountains and hills; small plains along coast
Algeria
mostly high plateau and desert; some mountains; narrow,
discontinuous coastal plain
American Samoa
five volcanic islands with rugged peaks and limited
coastal plains, two coral atolls (Rose Island, Swains Island)
Andorra
rugged mountains dissected by narrow valleys
Angola
narrow coastal plain rises abruptly to vast interior plateau
Anguilla
flat and low-lying island of coral and limestone
Antarctica
about 98% thick continental ice sheet and 2% barren rock,
with average elevations between 2,000 and 4,000 meters; mountain
ranges up to nearly 5,000 meters; ice-free coastal areas include
parts of southern Victoria Land, Wilkes Land, the Antarctic
Peninsula area, and parts of Ross Island on McMurdo Sound; glaciers
form ice shelves along about half of the coastline, and floating ice
shelves constitute 11% of the area of the continent
Antigua and Barbuda
mostly low-lying limestone and coral islands,
with some higher volcanic areas
Arctic Ocean
central surface covered by a perennial drifting polar
icepack that, on average, is about 3 meters thick, although pressure
ridges may be three times that thickness; clockwise drift pattern in
the Beaufort Gyral Stream, but nearly straight-line movement from
the New Siberian Islands (Russia) to Denmark Strait (between
Greenland and Iceland); the icepack is surrounded by open seas
during the summer, but more than doubles in size during the winter
and extends to the encircling landmasses; the ocean floor is about
50% continental shelf (highest percentage of any ocean) with the
remainder a central basin interrupted by three submarine ridges
(Alpha Cordillera, Nansen Cordillera, and Lomonosov Ridge)
Argentina
rich plains of the Pampas in northern half, flat to
rolling plateau of Patagonia in south, rugged Andes along western
border