The earth's inner core is solid because?

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j

Solve for r in the formula v = ir, when i = 5 and v = 15.