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Z-A contents of site

usa The physical, biological, and cultural portrait of the USA.

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sections | education | growth | sea level | area | migratory patterns | vegetative cover

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How big is the country?

What is the vegetation and population of the US like?

People and paradox

tree and grass

Contrasts: western versus eastern conditions.

The line drawn here is the hundredth meridian.

• Beyond the 100th meridian the amount of rainfall drops to below an amount that can sustain agriculture.

• The arid regions lie between this meridian and the coastal ranges of the Pacific ocean.

Comparing the east and the west: radiation, precipitation, vegetation & density

   
Los Angeles Chicago boston
Los Angeles, CA. Chicago, Illinois Charles River, Boston, Mass.
Western US Central US Eastern US

Ownership and the public domain

TaosPublic land

   Taos pueblo, New Mexico, First Nations' land.

west

Next. sections

Comparing the east with the west: topographical elevation and urbanization:


USA-geophysical features

Geophysical map compared to a population centers map of the lower forty-eight states of the United States.

 

Solar irradiance is the amount of sunlight available annually and differs by sections.

plant hardiness

Orange and red are the sunniest regions in terms of days per year of exposure to solar radiation.

solar exposure map

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Drought Index Map

The sectionalism evidenced here is north, south, & west.

Zones

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Open space and Density

2005

Red color represents dense, urban areas and orange less dense areas with recent migration, white is an absence of dense populations.

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sections | education | growth | sea level | area | migratory patterns | vegetative cover sections

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Education expenditures per capita:

 

sections | education | growth | sea level | area | migratory patterns | vegetative cover sections

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Lower Elevation and sea level

After a 600 foot, or 200 meter, rise in sea level, this is how the country will look. This happened 20 million years ago. Today, abrupt climate change means coastal erosion.

Hurricanes Weather map of the US showing the size of hurricane Jean, 2004.

Next. sections

coastal risks Maine Population growth and coastal density rates of population increase, 1940-2004.

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sections | education | growth | sea level | area | migratory patterns | vegetative cover sections

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Growth areas of the US. Mobility,
   
map mobility growth's costs
  where people are moving from (emigre) and moving to (immigrants).
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Often referred to as a sun belt, among the fastest growing regions of the nation.

Coastal

comp?

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sections | education | growth | sea level | area | migratory patterns | vegetative cover sections

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Size or areal extent matters: the USA is the third largest population on Earth and third in extent.

map

Only Canada and Russia exceed the USA in extent of territory or area.

 

Planet

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sections | education | growth | sea level | area | migratory patterns | vegetative cover sections

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US National Atlas

map