ISSN:
1476-4687
Quelle:
Nature Archives 1869 - 2009
Thema:
Biologie
,
Chemie und Pharmazie
,
Medizin
,
Allgemeine Naturwissenschaft
,
Physik
Notizen:
[Auszug] Records of long term variations in the Earth's magnetic field over the past 15,000 yr or so come from lake sediments1, marine sediments2, archaeological materials3 and also from observatory records covering the past few hundred years. Secular variations have also been convincingly demonstrated in ...
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1038/257207a0
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