5
DIVERSITY—LAND AND PEOPLE
from Bass Strait to form the highlands of Tasmania, never rises to even
half the height of Mont Blanc, Europe’s highest peak. Nonetheless,
from its highest point at 7,310 feet (2,228 m) at Mount Kosciuszko in
New South Wales to the lowest, at Lake Eyre in South Australia, at 49
feet (15 m) below sea level, Australia encompasses significant plateaus,
highlands, and lowlands. If Australia’s offshore islands are counted in
this statistic, there is even greater variation as Mawson’s Peak, located
on Heard Island near Antarctica, is taller than Kosciuszko, at 9,006
feet (2,745 m) (Australian Bureau of Statistics 2008, “Geography”). At
the low end, Lake Eyre is a massive salt sink with 3,741 square miles
(9,690 sq. km) of surface area and draining about one sixth of the main-
land in a catchment area of 440,156 square miles (1,140,000 sq. km).
Despite receiving water from such rivers as the Diamantina, Warburton,
Macumba, and Cooper’s Creek, Lake Eyre is often totally dry and has
filled to capacity only three times in more than 150 years, the last in
1984 (Geoscience Australia 2009, “Largest Waterbodies”).
In conjunction with these extremes in elevation, Australia exhib-
its great variation in average temperatures. The extremes range from
123.6°F (50.7°C) at Oodnadatta, South Australia, in 1960 to -9.4°F
(-23°C) at Charlotte Pass, in Kosciuszko National Park, New South
Wales, in 1994. The hottest place in the country is Marble Bar, Western
Australia, with an annual mean temperature of over 99.5°F (37.5°C),
while Collinsvale, Tasmania, a suburb of Hobart, is the coldest place
with an annual mean temperature of just 45.5°F (7.5°C) (Geoscience
Australia 2010, “Climatic Extremes”).
While most of these figures set Australia apart from other countries
in the world, perhaps the most dramatic of all concerns the relative age
of the land upon which its people have made their home. In contrast
with much of North America’s landscape, which dates from the last ice
age about 20,000 years ago, most of Australia’s geographic features were
formed millions of years ago and have not been significantly altered by
glaciation for about 290 million years (Australian Bureau of Statistics
2008, “Geography of Australia”). Virtually the only relatively new fea-
ture of Australia is its coastline, which came into being about 12,000
years ago, when rising sea levels at the end of the last ice age separated
Tasmania, the Torres Strait Islands, New Guinea, and thousands of
other, smaller islands from the mainland. At the other end of the spec-
trum, some sands in Western Australia have been found to be 4.25 bil-
lion years old (Geoscience Australia 2007), almost a billion years older
than the first bacterial life that emerged in the world’s oceans. Since that
time long ago, the Australian landmass has moved around the Earth