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Rocky Mountains
A major mountain system of the united states and Canada, extending 3,000 miles from Alaska south to New Mexico.
Category: Glossary
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Rub al Khali
Also known as the empty quarter. One of the world’s largest sandy deserts covers about 250,000 square miles (647,497 square km). Located on the Arabian peninsula.
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Runoff
Rainfall is not absorbed by the soil, carrying pesticides and fertilizers from fields into rivers, endangering the food chain.
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Russian revolution
The revolt of 1917, in which the Russian communist party, led by V. I. Lenin, took control of the government from the czars.
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Russification
The effort, particularly under the Soviets, to implant Russian culture in non-Russian regions of the former Soviet Union and its Eastern European neighbors.