They are based on Islam or Christianity
<span>Their progress and wealth is highly dependent on the harvests, and
the price of grain. They probably have to import some industrial
products and if they had a bad year (weather, other catastrophies, poor
technology) they can't get the necessary amount of industrial products
in exchange for their surplus e. g. in grain. </span>
Answer:
The most vital function of Earth's magnetic field is to deflect most of the solar winds. The solar winds are dangerous level of radiation, that would kills us without our magnetic field.
Answer:
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Investigate past climate and atmospheric changes