sentence: Oil is also a resource in some places.
sentences_before: Brazil's soil is very good for growing coffee. A great number of minerals have been found. Few, however, have been mined. Among those that were mined are iron, manganese, gold, and gemstones. The tropical forests are rich in valuable trees, like mahogany, ebony, and rubber.
concept_name: oil
headings: South America Natural resources
categories: Gondwana