A free, self-paced textbook in 7 chapters. Read a chapter, then drill it with the 100 companion flashcards using spaced repetition.
The Earth is divided into seven continents: Africa, Antarctica, Asia, Australia (also called Oceania), Europe, North America, and South America. Together, they account for all of t...
By land area, the three largest countries are Russia, Canada, and the United States. Russia, at approximately 17.1 million square kilometers, stretches across Eastern Europe and no...
Rivers are the lifeblood of continents, and the world's longest is traditionally the Nile, flowing about 6,650 kilometers northward through northeastern Africa to the Mediterranean...
Mountains form the backbones of continents, and the highest point on Earth is Mount Everest in the Himalayas, reaching 8,849 meters above sea level on the border between Nepal and...
Five oceans cover the Earth: the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic. The Pacific is the largest and deepest, spanning about 165.25 million square kilometer...
Earth's surface is organized by an invisible grid of latitude and longitude. Latitude measures how far north or south a point is from the Equator, ranging from 0° at the Equator to...
Some of the most striking geographic features result from human engineering. The Panama Canal, a 77-kilometer artificial waterway completed in 1914, connects the Atlantic and Pacif...