What are the causes of desertification and the problem it poses for sub-saharan farming?

When you cross a time zone going east, what happens to the time

Are divergent boundaries responsible for tsunamis?

Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain