1) Does variability of geomagnetic field in time and in a wide range of periods – from minutes to hundreds and thousands of years reflect a complicated of physico – chemical phenomena in the core, lithosphere, ionosphere and magnetosphere of the earth?
2) Are data ongeomagnetic variations with the periods over 1 year, the so – called secular variations (SV), widely used?
3) In general, geomagnetic field variations can be considered as a vector sum of the fields from different sources, can't they?
4) Are there distinctly distinguished global, regional and local components?
5) Do global peculiarities or focuses of SV embrace areas of thousands of kilometers and have their sources in the earth's core?
6) Regional and local effects are determined by modern physico – chemical, geodynamic and electromagnetic phenomena in the earth's crust and upper mantle, aren't they?
7) What is determined by modern physico – chemical, geodynamic and electromagnetic phenomena in the earth's crust and upper mantle?
8) Does the existing chain of magnetic observatories on the territory of Europeallow to study in details the global and regional effects in SV?
9) The local anomalies of SV or the so – called tectomagnetic effects were studied, as a rule, in geodynamic and seismoprognostic testing grounds, weren't they?
1 He's got a beautiful voice.
2 He studies hard
3 Ann is a wonderful girl!
4 It is cold today.
5 He always does his housework quickly.
...
2.Ann enjoys singing
3.Lilia enjoys reading.
4. Max enjoys playing football.
5.Lisa enjoys playing tennis.
6.Mark enjoys going to museum
1)Look at!
2)Why?
3)What do you need?
Европейские колонисты стали истреблять голубей как вредителей садов и огородов. Уничтожали с небывалым размахов: гнездящихся птиц травили газом и убивали палками. Стаи расстреливали из ружей и даже из пушек. В результате в 80-х годах 19 века странствующие голуби стали катастрофически быстро исчезать. Последнее гнездо в природе видели в 1894 г. , теперь этих птиц можно увидеть только в виде чучела в музеях. В 1914 г. в зоопарке города Цинциннати (Северная Каролина, США) погибла Марта - последняя представительница ранее многочисленного рода странствующих голубей.