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A graben, or rift valley, forms when a block of Earth’s crust sinks between parallel faults, creating a depressed landform in tectonically active regions. For a detailed description, click on the article title.
The Grand Canyon, carved by the Colorado River over millions of years, is an iconic Arizona landmark attracting millions with its immense scale and natural beauty. For a detailed description, click on the article title.
The Great Barrier Reef, spanning northeast Australia, is the world’s largest coral reef and a delicate ecosystem threatened by climate change and human activity. For a detailed description, click on the article title.
The Great Game was a 19th-century struggle between the British and Russian empires over control of Central Asia, marked by rivalry, espionage, and military campaigns. For a detailed description, click on the article title.
The Great Kanto Earthquake of 1923 devastated Tokyo and Yokohama, killing an estimated 140,000 people and reshaping Japan’s urban and social landscape. For a detailed description, click on the article title.
The Great Lakes—Superior, Michigan, Huron, Erie, and Ontario—are North America’s largest freshwater system, vital for ecosystems, commerce, and communities. For a detailed description, click on the article title.
The Great Plains, a vast central North American grassland, rise to 4,000 feet and are known for their treeless expanse, agriculture, and ecological significance. For a detailed description, click on the article title.
The Great Rift Valley, stretching from Syria to Mozambique, is a vast tectonic trough shaped by plate separation, famed for its stunning landscapes and rich human history. For a detailed description, click on the article title.
The Great Trek, a Boer migration from the Cape Colony in the 1830s, aimed to escape British rule and create independent republics in South Africa’s interior. For a detailed description, click on the article title.
Great Zimbabwe, founded by the Shona around 1000 CE, became a thriving gold-trading city famed for its impressive stone structures and political power. For a detailed description, click on the article title.
The Green Revolution introduced high-yielding seeds, mechanization, irrigation, and chemicals, transforming traditional agriculture and boosting global food production. For a detailed description, click on the article title.
The greenhouse effect traps heat in Earth’s atmosphere, warming the planet; human activities have intensified this process, driving global warming. For a detailed description, click on the article title.
Gross Domestic Product (GDP) measures the value of goods and services produced within a country annually, reflecting economic performance but excluding foreign income. For a detailed description, click on the article title.
Gross National Product (GNP) measures the total value of goods and services produced by a country’s residents, including global income, offering a broader economic view. For a detailed description, click on the article title.
Groundwater is water stored beneath the Earth’s surface in rock and soil pores, essential for drinking, agriculture, and sustaining natural ecosystems. For a detailed description, click on the article title.
The Group of 10 (G-10), formed in 1962, unites major economies to coordinate credit policy and support the IMF, serving as an informal global financial steering group. For a detailed description, click on the article title.
The Group of 11 (G-11), formed in 2006 by developing nations, aims to bridge the income gap with richer countries through cooperation and global economic reform. For a detailed description, click on the article title.
The Group of 15 (G-15), founded in 1989, unites developing nations to promote economic cooperation and act as a political voice within the Non-Aligned Movement. For a detailed description, click on the article title.
The Group of 20 (G-20), founded in 1999, unites major economies to discuss and address global economic stability, growth, and development challenges. For a detailed description, click on the article title.
The Group of 24 (G-24), established in 1989, represents developing nations in global financial discussions to promote equitable policies and fair international representation. For a detailed description, click on the article title.