Featured Article: How the Ice Age Worked
Much of the ice has melted, and the woolly mammoths are long gone. But could we still be in an ice age and headed for another? See more »
terms library
Want to know what an aclinic line or natural bridge is? Discover some of the most common terms used in study of geography.
How did the supercontinent Pangaea become seven separate continents?
Like the members of an ill-fated rock group, the seven continents struck out on their own hundreds of millions of years ago. But what caused the breakup? And is a reunion tour in the works?
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How Naming the Continents Works
Continents aren't the unchanging, universally recognized land masses of our school studies. But they do help us make sense of our world. How did they get their names?
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How the Ice Age Worked
Much of the ice has melted, and the woolly mammoths are long gone. But could we still be in an ice age and headed for another?
See more »
How Waterfalls Work
Some people like to honeymoon at Niagara Falls, while others go over the falls in a barrel. How do these geological formations come to be?
See more »A.H. Guyot
Guyot, Arnold Henry (1807–1884), a Swiss-American geographer and geologist. Guyot wrote textbooks that helped popularize geology and geography in the United States.
See more »Aclinic Line
Aclinic Line, or Magnetic Equator, an imaginary, irregular line circling the earth near the geographical equator.
See more »Altitude
Altitude, the height or elevation of a point or object above a given reference level.
See more »America
America, the lands of the Western Hemisphere, including the continents of North America and South America and nearby islands.
See more »Archipelago
Archipelago, a term applying to any sea containing clusters of islands, or to the island groups themselves.
See more »Badlands
Badlands, an area of severe erosion, marked by deep ravines, sharp ridges, pinnacles, and other landforms carved by running water.
See more »Baedeker
Baedeker, a tourist guidebook prepared by a firm established by the German publisher Karl Baedeker (1801–1859).
See more »Bay
Bay, in geography, a part of a sea or lake in the form of an inlet, similar to a gulf but usually smaller.
See more »Bayou
Bayou, a term used widely in the Gulf Coast states, especially Louisiana, for a swampy area.
See more »Bog
Bog, an expanse of wet, spongy ground composed largely of partially decayed or decaying plants.
See more »Canyon
Canyon, a deep valley with steep sides. A narrow canyon with almost perpendicular sides is known as a gorge.
See more »City
City, a large or important town. Cities are the commercial, industrial, financial, political, and cultural centers of a nation.
See more »Coastal Plain
Coastal Plain, a strip of low-lying land along a seacoast, sloping gently toward the sea.
See more »Continent
Continent, the name applied to the largest divisions of land in the world. Although they form one landmass, Europe and Asia (often referred to as Eurasia) are counted as two continents.
See more »County
County, an administrative division of a country or state. In the United States it is the largest division within a state.
See more »Dalles
Dalles, or Dells, rapids in a river where the water flows over slab-like rock in a narrow trough or gorge.
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