Skip to main content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Topic Pages - World Ecosystems
Marshy, low-lying subtropical savanna area, c.4,000 sq mi (10,000 sq km), S Fla., extending from Lake Okeechobee S to Florida Bay. Characterized...
Great Barrier Reef
Chain of coral reefs and islands about 2,000 km/1,250 mi long, in the Coral Sea, off the east coast of Queensland, Australia...
[Span.,=tortoises], archipelago and province (1990 pop. 9,785), 3,029 sq mi (7,845 sq km), Ecuador, in the Pacific Ocean c.650 mi (1,045 km) W...
Topic Pages - Biomes and Habitats
Interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five)...
A dense growth of trees, together with other plants, covering a large area of land. The science concerned with the study, preservation, and...
Arid region, usually partly covered by sand, having scanty vegetation or sometimes almost none, and capable of supporting only a limited and...
High land mass projecting conspicuously above its surroundings and usually of limited width at its summit. Although isolated mountains are not...
Shallow body of water in a low-lying, poorly drained depression, usually containing abundant plant growth dominated by trees, such as cypress...
Treeless plains of N North America and N Eurasia, lying principally along the Arctic Circle, on the coasts and islands of the Arctic Ocean, and...
The northern coniferous forest or boreal forest that extends over vast areas of Russia, Scandinavia and North America. Taiga is the Russian word...
Dense forest usually found on or near the Equator where the climate is hot and wet. Moist air brought by the converging trade winds...