Introduction
Tip
Visit the Definitions and Notes page to view a description of each topic.
Geography
Area - comparative
Africa-US area comparison map:
Antarctica-US area comparison map:
Asia-US area comparison map:
Australia-US area comparison map:
Europe-US area comparison map:
North America - US area comparison map:
South America-US area comparison map:
People and Society
Environment
World biomes
World Biomes:
Tundra biome:
Circum-polar Extent of Permafrost:
Coniferous Forest biome:
Temperate Deciduous Forest biome:
Rainforest biome:
Grassland biome:
Shrubland biome:
Desert biome:
