Antarctica before the Antarctic Treaty
by Helen Gavaghan.
CLASSIFICATIONS IN BIOLOGY: Life, Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
GEOLOGICAL AGES. bya means billion years ago.
EONS: Hadean (4.6 to 4 bya), Archaen (4.0 to 2.5 bya), Proterozoic (2.5 to 0.542 bya).
Source: British Geological Survey.
The shortest wavelengths are gamma rays. The longest are radio waves, ranging from 100s to 10-thousand centimetres from peak to peak. The distance between peaks of gamma rays are billionths/millionths of centimetres. Between the two extremes lie X-rays, ultra violet, visible, infrared and microwaves.
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History of artificial satellites
by Helen Gavaghan
Springer Verlag/Copernicus (New York)