The Grand Canal in Hangzhou, an ancient shipping route and direct connection between Beijing and Hangzhou, Hangzhou, China, Asia

Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.

Little boy sits on an old tractor and steers, black and white, Allgäu, Bavaria

Bride and groom, bride with traditional hair hood in the Shimogamo shrine, Kyoto, Japan, East Asia, Asia

Three boys and a girl sitting on the floor, relaxing in the sun

Young woman relaxing with an ipod mp3 player, listening to music

Man's face painted in rainbow colours, on the CSD Christopher Street Day in Berlin on 19 June 2010, Germany, Europe

Two camels in the evening light in front of the great sand dunes of Khorgoryn Els in the Gobi Desert, Gurvan Saikhan National Park, Oemnoegov Aimak, Mongolia, Asia

Grey seals (Halichoerus grypus) at sunrise, Heligoland, Schleswig-Holstein, Germany, Europe

Native Woman with typical hat and Thanaka paste on the face, portrait, Nyaung Shwe, Shan State, Myanmar, Asia

Child with Thanaka paste in the face of mountain tribe or mountain people Pa-O or Pa-Oh or Pao or Black Karen or Taungthu or dew-soo, ethnic minority, portrait, near Kalaw, Shan State, Myanmar, Myanmar, Asia

Female cyclist in urban surroundings

Climbers make their way to Advanced Basecamp (ABC) through the massive Western Cwm (glacial valley) on the Southeast Ridge route on Mt. Everest, Nepal. Everest's Southwest Face rises to the left with Lhotse and the Lhotse Face in the distance. Jake Norton, 4, 20, 2002, Western Cwm, Everest, Nepal.

Multi-coloured flags in sky on kite festival at Fano beach, Denmark

View of beach sailors at Fano beach, Denmark

Multi-coloured flags in sky on kite festival at Fano beach, Denmark

View of beach sailors at Fano beach, Denmark