Pumping station to supply agricultural irrigation channels, Bank of the Nile River near Esna, Egypt, North Africa, Africa

Close-up of a round green squash on the vine in the garden with water droplets, Calgary, Alberta, Canada

Brown bear, Lake Clark National Park, Alaska, USALake Clark National Park, Alaska, USA

Black Rock Desert in Nevada. Arid cracked crusty surface of the salt flat playa. Wheatgrass plants with a dense network of roots in shallow soil with bright fresh green leaves and stalks.

Black Rock Desert in Nevada. Arid cracked crusty surface of the salt flat playa. Wheatgrass plants with a dense network of roots in shallow soil with bright fresh green leaves and stalks.

Instrument for measuring soil humidity at research station ?La Selva? in Puerto Viejo de Sarapiqui, Costa Rica