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Tunnel effect
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Monoclonal
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Lapilli
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Double-stranded
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Parsnip
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Angina
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Sun
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Longitude
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Tritium breeding blanket
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CryoSat
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Key splitting
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Numbering plan
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ITS
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Land surveyor
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Tiagabine
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Heliopause
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Solar time
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Exobiology
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Hyponatraemia
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Comma
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Astronautics
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Sub-addressing
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Sodium-rich rock
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DMT
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Plain text
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Sea ice - Grey
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Ecotone
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Amplexus
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Baryon
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Cretaceous
Erg
The term erg is used in geography and physics.
Geography
An erg is a desert with wind dunes. In the Sahara, ergs constitute 20 % of the surface area.
Physics
Erg is the abbreviation of the Greek ergon. It is a unit of measurement for work in the CGS system (physical measurement unit system).
1 erg is equal to 10-7 joules.
There are many ergs in the Sahara. © Alex Lichtenberger, Flickr CC by-nc-nd 2.0
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