Subscribe Now! National Geographic Magazine $15
Home
Animals
Daily News
Environment
Games
Green Guide
History
Kids
Maps
Music
Photography
Science & Space
Travel & Cultures
Video
National Geographic Channel
Magazines
National Geographic
Traveler
Adventure
Shop
Subscriptions
TV & Film
Travel With Us
Our Mission
Visit our Online Shops
Books & Atlases
Clothing & Accessories
DVDs
Maps
Catalog Quick Shop

Sign up for free

Newsletters

Once a month
get new photos
and expert tips.

Sign up

Kalahari Clouds
Photo: Cloudy sky in the Kalahari
WALLPAPER
Light, fluffy clouds stretch across the broad sky of South Africa's Kalahari Desert. Most clouds are produced by the upward motion of air, which may be caused by weather or local topography.
Photograph by Mattias Klum

Related Photo Galleries
Photo: Midnight sun on Baffin Island, Canada

Photo Gallery: Climate

Photo: Waterfall and turquoise water on Baffin Island

Photo Gallery: Erosion and Weathering

Photo: Sunrise over Coastguard Beach

Photo Gallery: Coastlines

Earth Topics

SPECIAL ADVERTISING SECTION
Photo: 2009 Winner

Photo Contest

Find out who takes home the Grand Prize!

View Gallery
Photo: Glass of water

Take Quiz

Test your water knowledge.

Learn More

Order Human Footprint on DVD Today
Image: Cover of Human Footprint DVD

Discover the extraordinary impact that an average human life has on the world.

Buy the DVD

Natural Disasters
Photo: A tornado

Get the science behind avalanches, tsunamis, and more.

Go Now

Support Conservation
Photo: Two penguins

Help conserve the world's natural resources.

Learn More