Tell me some ways of proving the spherical nature of the earth

Acity developer is considering building an amusement park near a local river. what tool would the developer predict the future path of the river? a. series of city maps from nearby cities b. series of topographic maps in chronological order c. guide map of the new amusement park d. thermal map of the area

The red square is a famous historical site that is located in

Trade routes emerged along which coast when arab and indian traders from around the indian ocean mixed with the bantu people from africa's interior? a. swahili coast b. guinea coast c. drakensberg coast d. namib coast