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Secular
variations of geomagnetic field

Variability
of geomagnetic field in time and in a wide range of periods – from minutes to
hundreds and thousands of years reflects a complicated of physico – chemical
phenomena in the core, lithosphere, ionosphere and magnetosphere of the earth,
to investigate modern geodynamic processes at different depths, from the
surface layers of the earth*s crust to the core of the earth, data on
geomagnetic variations with the periods over 1 year, the so – called secular
variations (SV), are widely used. In general, geomagnetic field variations can
be considered as a vector sum of the fields from different sources. In the
spatial structure of secular variations of geomagnetic field there are
distinctly distinguished global, regional and local components. Global
peculiarities or focuses of SV embrace areas of thousands of kilometers and
have their sources in the earth*s core. Regional and local effects are
determined by modern physico – chemical, geodynamic and electromagnetic phenomena
in the earth*s crust and upper mantle.



The existing
chain of magnetic observatories on the territory of Europe
allows to study in details the global and regional effects in SV. The local
anomalies of SV or the so – called tectomagnetic effects were studied, as a
rule, in geodynamic and seismoprognostic testing grounds.

1.Olga (to write) me a letter last week.
2.The weather in Moscow (to be) very fine next summer, I think.
3.Usually I (to like) travelling in summer.
4.Nick (to leave) home at half past six yesterday.

лет. У меня есть мама, папа, брат и кошка.Я могу плавать и рисовать.

текст пожалуйста прошу побыстрей

1. Present Simple. They watch TV-set every evening.
2. Past Simple.
3. Future Simple.
4. Present Progressive.
5. Past Progressive.
6. Future Progressive.
7. Present Perfect.
8. Past Perfect.
9. Future Perfect.
10. Present Perfect Progressive.
11. Past Perfect Progressive.
12. Future Perfect Progressive.

Помогите пожалуйста надо написать сочинение на тему "Олимпийские игры 2014"