Who did spain send to explore after the voyages of columbus, and what did they discover?

Which of the following areas has the highest population density?

Which movement developed in the early 1900s and encouraged the nationalist spirit of africans throughout the world? a. african nationalist b. tribalism c. pan-africanism d. african union

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?