Which sentence from the section "the halloween storm" best summarizes its main idea?
a)during the halloween storm, for example, magnetic direction in alaska quickly changed by more than 20 degrees
b)in mid october 2003, a bundle of concentrated magnetic energy emerged from the sun's interior, forming a large sunspot, a site of seething activity
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c)magnetic storms are global phenomena, and their effects can be easily seen around the world,
d)in other words, the storm was so farge that it could be measured with a simple compass

You learned in this lesson that the mythical trojan war was instrumental in forming greek culture. it has been said that there were no real "greeks" before this, just relatively unconnected kingdoms in the land that would later be called greece. how did the story of the war "make" greek culture? select all that apply. it provided something for all greeks to talk about. it gave greeks a common history. it represented a moment when the different kingdoms came together for a common cause, unifying the different kingdoms into one greece. it showed how agamemnon conquered the lesser kingdoms and unified them under his rule.

What point is the author trying to make by comparing the travel times of the first transcontinental railroad and the first transcontinental flight?

Which of the following statements would most encourage productive conflict? select all that apply.