When it is winter in europe, what season is it in asia and why?

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

What statement about charlemagne is not true? a. charlemagne's empire collapsed during his rule b. charlemagne sent missionaries throughout europe c. charlemagne encouraged the arts and education d. charlemagne ruled much of western europe a. charlemagne's empire collapsed during his rule

The graph below plots the temperature and luminosity of stars on the main sequence.