Read the following passage from a book that david livingstone wrote about his travels in central africa."the country is becoming very beautiful, and furrowed [lined] by deep valleys; the underlying rocks, being igneous, have yielded [given] fertile soil. there is great abundance of large game [animals to hunt]. . we crossed the mbai [river] and found in its bed rocks of pink marble. some little hills near it are capped by marble of beautiful whiteness."which best summarizes livingstone's description of africa?