Tenerife, satellite image
Tenerife, satellite image. Satellite image of Tenerife showing Mount Teide (lower centre). Vegetation is green, and water is blue. Tenerife is the largest of the Canary Islands, a Spanish archipelago situated in the Atlantic Ocean off the coast of north Africa. Mount Teide is an active volcano and is the highest mountain in the Canary Islands and Spain. Mount Teide and is surroundings make up the UNESCO World Heritage Site of the Teide National Park
© PLANETOBSERVER/SCIENCE PHOTO LIBRARY
Australia - Balls pyramid
Australia - Ball's pyramid
Lord Howe Island, Mt. Lidgbird & Mt Gower covered by clouds.
An erosional remnant of a shield volcano & caldera formed 7 million years ago. 551 meters high. A sea stack in the Tasman Sea, part of the Lord Howe Island Marine Park. Largest sea stack in the world.
Jean Paul Ferrero
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© Jean-Paul Ferrero/ardea.com
H-He-Hg emission spectra
H-He-Hg emission spectra. Graphical representation of the emission spectra lines for the elements hydrogen (H), helium (He) and mercury (Hg). The vertical bars represent the colour and wavelength (in nanometres) of the lines seen in spectra from light emitted by excitation of these elements in gaseous form. Studying the peaks in emission spectra from unknown materials enables the identification of elements present in those materials, a technique known as emission spectroscopy
© SCIENCE PHOTO LIBRARY