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?
Timothy isn't feeding his dog
Is Timothy feeding hid dog?
Last summer we don't went to river every day.
Do we went to river every day last summer?
<span>6. Della was hurrying from shop to shop looking for a
present for Jim. 7. The other day my sister and I (went
shopping together. We entered a big shop in Arbat street.
While my sister was choosing a new hat, I looked
for a pair of gloves. 8. The moment he heard
the news, Jim called me by telephone. 9. Just as I was leaving for home, a student (to stopped me in the hall. <span>10.
When I last saw her she was hurrying along the
road to the station. I asked her where she was going
and she said to London, but I don’t think she told the truth because there was not any train to London at
that time.</span></span>