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Introduction References & Edit History Quick Facts & Related Topics

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Flower. Fruit tree. Cherry. Cherry tree. Cherry blossom. Spring. Close-up of cherry blossoms in bloom.

The Perils of an Early Spring

Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.

What Is Earth’s Velocity?

September 11, 2005, ozone thinning over antarctica reached its maximum extent for the year.

Is the Ozone Layer Finally Healing Itself?

High-oblique view of the extra-tropical unnamed cyclone that merged with Hurricane Earl is featured in this image taken by an Expedition 24 crew member on the International Space Station (Sept. 2010).

Is the Number of Hurricanes Increasing?

Blackboard inscribed with scientific formulas and calculations in physics and mathematics

The World Science Festival’s Pioneers in Science

Discover

Russian grand duchess Anastasia; undated photograph. (Anastasiya Nikolayevna, Tsar Nicholas II)

Did Duchess Anastasia Survive Her Family’s Execution?

Flags of the countries of the world (flagpoles).

How Many Countries Are There in the World?

New Zealand. Political/Physical map. Includes locator.

Where Is “Old Zealand”?

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics

10 Greatest Baseball Players of All Time

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

simoom: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	Samum • poison wind

Topics

local wind system etesian wind haboob khamsin katabatic wind levanter gregale anabatic wind shamal sirocco

Quiz

Lightning over a farm field. Weather electricity thunderstorm light energy tree

Facts You Should Know: Weather Quiz

rain. Child in the rain, wearing a rain coat, under a yellow umbrella. April Showers weather climate rain storm water drops

April Showers to March’s Lions and Lambs

Umbrella colored like a rainbow sticking out above a sea of black umbrellas while it rains. (storm, weather)

Weather Words Vocabulary Quiz