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

Armenia
Armenian Highland with mountains; little forest land; fast
flowing rivers; good soil in Aras River valley

Aruba
flat with a few hills; scant vegetation

Ashmore and Cartier Islands
low with sand and coral

Atlantic Ocean
surface usually covered with sea ice in Labrador Sea,
Denmark Strait, and coastal portions of the Baltic Sea from October
to June; clockwise warm-water gyre (broad, circular system of
currents) in the northern Atlantic, counterclockwise warm-water gyre
in the southern Atlantic; the ocean floor is dominated by the
Mid-Atlantic Ridge, a rugged north-south centerline for the entire
Atlantic basin

Australia
mostly low plateau with deserts; fertile plain in southeast

Austria
in the west and south mostly mountains (Alps); along the
eastern and northern margins mostly flat or gently sloping

Azerbaijan
large, flat Kur-Araz Ovaligi (Kura-Araks Lowland) (much
of it below sea level) with Great Caucasus Mountains to the north,
Qarabag Yaylasi (Karabakh Upland) in west; Baku lies on Abseron
Yasaqligi (Apsheron Peninsula) that juts into Caspian Sea

Bahamas, The
long, flat coral formations with some low rounded hills

Bahrain
mostly low desert plain rising gently to low central
escarpment

Bangladesh
mostly flat alluvial plain; hilly in southeast

Barbados
relatively flat; rises gently to central highland region

Belarus
generally flat and contains much marshland

Belgium
flat coastal plains in northwest, central rolling hills,
rugged mountains of Ar