Earth's Geography

Earth's geography encompasses the planet's physical features, landforms, and spatial distribution of natural elements. It studies how these features interact with climate, ecosystems, and human activity across its 510 million km² surface.

Surface Composition
Earth's surface is 71% ocean and 29% land, with oceans averaging 2.5 miles deep and hosting mid-ocean ridges over 40,000 miles long. Land primarily forms seven continents:

Africa, Antarctica, Asia, Australia, Europe, North America, and South America, surrounded by the Arctic, Atlantic, Indian, Pacific, and Southern Oceans. Most land is humid and vegetated, though polar ice sheets hold more water than all groundwater, lakes, and rivers combined.

This topographic map highlights elevations from deep ocean trenches in blue to mountain peaks in pink, showing continental and oceanic features clearly.

Landforms and Processes
Landforms include mountains, plateaus, plains, valleys, and volcanoes, shaped by plate tectonics, erosion, weathering, and biological activity. Tectonic plates in the crust create earthquakes, mountain ranges, and volcanoes, while processes like ice, wind, and water continually reshape the surface. Rough terrains dominate western continental edges, with flatter plains and river systems in central and eastern areas. 

Hemispheres and Zones
Earth divides into Northern/Southern hemispheres by latitude and Eastern/Western by longitude, with most land in the Northern and land hemisphere. Key zones include tropics, subtropics, temperate regions, and polar areas, influencing climate and vegetation like grasslands, forests, and deserts


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