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.”