During the age of discovery, what was common reason rulers sent explorers to unknown lands

What's a concern about diseases spreading in africa?

What features form as an oceanic plate moves across a hot spot?

Which primary subsistence crop is in danger due to soil erosion

What does the presence of dinosaur footprints in an area where no dinosaurs bones were found suggest the area was once underwater dinosaurs were never in that area the climate was too hot for dinosaurs dinosaurs were at some time in the area

What is a major difference between comets and asteroids

What is most important for converting dry, infertile land into green or arable land.

Light pollution can be decreased by:

What river in Africa was essentially used as a highway to transport gold and salt? A. The Nile River B. The Niger River C. The Kengali River D. The Senegal River

Explain why acid precipitation is a source of international conflict and why international cooperation is necessary to resolve the problem.

Explain why resource availability and allocation are an important concem for governments. Anyone know this