Causes of earthquakes in relation to plate boundaries

Witch one is it soo it the the question b.a,b,c,d

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade

Why did the belgian parliament pass laws to decentralize its government? a. to increase trade with neighboring luxembourg b. to decrease the political power enjoyed by the flemish c. to enable belgium to join the european union d. to reduce tensions between belgium's two main ethnic groups